This compilation Copyright (C) 2005 Mike Sebastian. No copyright claim is made to original U.S. Government works.

Calculator Patents - Texas Instruments


U.S. Patent No. Assignee File Date Issue Date Inventor1 Product Title Comments
3725907 TI June 1, 1971 April 3, 1973 Boulanger Klixon? Pushbutton keyboard system -
3806673 TI November 20, 1972 April 23, 1974 Boulanger - Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure Unrecognized
3819921 TI September 29, 1967 June 25, 1974 Kilby CalTech Miniature electronic calculator The Kilby/Merryman/Van Tassel patent that started the handheld calculator market
3851313 TI February 21, 1973 November 26, 1974 Chang TMS0200/TMS0300 family 16-digit 10-register chip Memory cell for sequentially addressed memory array -
3855577 TI June 11, 1973 December 17, 1974 Vandierendonck TMS0200/TMS0300 family 16-digit 10-register chip Power saving circuit for calculator system -
3887791 TI November 8, 1973 June 3, 1975 Kitchens SR-50/51 Prismatic display window for a calculator -
3892957 TI September 24, 1973 July 1, 1975 Bryant TMS0800 family Digital mask logic combined with sequentially addressed memory in electronic calculator chip Calculator chip with mask programmable ROM; includes source code (mostly unreadable)
3893088 TI July 19, 1971 July 1, 1975 Bell TMS1802 Random access memory shift register system -
3900722 TI September 13, 1973 August 18, 1975 Cochran SR-50/51 Multi-chip calculator system having cycle and subcycle timing generators Multi-chip calculator system; includes TMC0501 object code
3902054 TI September 13, 1973 August 26, 1975 Cochran SR-50/51 Calculator system having keyboard with double entry protection and serialized encoding Object code for TMC0501
3904862 TI September 13, 1973 September 9, 1975 Cochran SR-50/51 Calculator system having a constant memory Object code for TMC0501
3904863 TI September 13, 1973 September 9, 1975 Cochran SR-50/51 Calculator system using instruction words as data Object code for TMC0501
3909626 TI December 28, 1973 September 30, 1975 Balasubramaniam - Control of axb matrix thermal printhead Thermal print head driver chip; discussed as being used with TMS0100
3916169 TI September 13, 1973 October 28, 1975 Cochran SR-50/51 Calculator system having a precharged virtual ground memory Object code for TMC0501
3919532 TI September 13, 1973 November 11, 1975 Cochran SR-50/51 Calculator system having an exchange data memory register Object code for TMC0501
3919536 TI September 13, 1973 November 11, 1975 Cochran SR-50/51 Precharged digital adder and carry circuit Object code for TMC0501
3921142 TI September 24, 1973 November 18, 1975 Bryant TMS0800 family Electronic calculator chip having test input and output Includes source code
3922538 TI September 13, 1973 November 25, 1975 Cochran SR-50/51 Calculator system featuring relative program memory Object code for TMC0501
3924110 TI September 13, 1973 December 2, 1975 Cochran SR-50/51 Calculator system featuring a subroutine register -
3931507 TI November 26, 1974 January 6, 1976 Brantingham integrated injection logic (I2L) Power-up clear in an electronic digital calculator With source code
3932846 TI September 24, 1973 January 13, 1976 Brixey TMS0800 family Electronic calculator having internal means for turning off display -
3934229 TI December 10, 1973 January 20, 1976 Cochran TMS0800 family External register memory chip in a calculator system -
3934233 TI September 24, 1973 January 20, 1976 Fisher TMS0800 family Read-only-memory for electronic calculator Includes source code
3937940 TI November 26, 1974 February 10, 1976 Brantingham integrated injection logic (I2L) Direct compare in an electronic digital calculator Includes source code
3939335 TI November 26, 1974 February 17, 1976 Brantingham integrated injection logic (I2L) Universal condition latch in an electronic digital calculator Includes source code
3944983 TI June 11, 1973 March 16, 1976 Gale TMS0200/TMS0300 family 16-digit 10-register chip Expandable data storage for a calculator system -
3946216 TI September 24, 1973 March 23, 1976 Vandierendonck TMS0800 family Electronic calculator system having serial transfer of instruction word fields to decode arrays -
3946852 TI March 11, 1974 March 30, 1976 Watson - Printer Daisy wheel printer for a calculator
3949367 TI December 28, 1973 April 6, 1976 Cochran - Drum printer control Printer controller chip that interfaces to TMS0200/TMS0300 chipset (SR-50)
3952174 TI November 29, 1974 April 20, 1976 Boulanger plastic bkpl kbd Pushbutton keyboard system Plastic backplane keyboard
3953719 TI November 26, 1974 April 27, 1976 Brantingham integrated injection logic (I2L) Latched decoder for digital outputs to an electronic digital calculator display Includes source code
3955181 TI November 19, 1974 May 4, 1976 Raymond TMS0100 family Self-refreshing random access memory cell -
3956620 TI November 26, 1974 May 11, 1976 Brantingham integrated injection logic (I2L) Adder with carry enable for bit operations in an electric digital calculator Includes source code
3958223 TI June 11, 1973 May 18, 1976 Cochran TMS0200/TMS0300 family 16-digit 10-register chip Expandable data storage in a calculator -
3959611 TI January 10, 1975 May 25, 1976 Greene klixon kbd Pushbutton keyboard system having plural level wire-like contact -
3962571 TI November 26, 1974 June 8, 1976 Brantingham integrated injection logic (I2L) Low power digit blanking circuit Includes source code
3967104 TI November 26, 1974 June 29, 1976 Brantingham integrated injection logic (I2L) Direct and indirect addressing in an electronic digital calculator Includes source code
3970995 TI February 27, 1974 July 20, 1976 Baudouin TMS0100 family Slaving calculator chips -
3973091 TI February 3, 1975 August 3, 1976 Kaminski ? Pushbutton keyboard assembly having pole and inner contacts simultaneously engaged by a bridging contact -
3976975 TI February 4, 1974 August 24, 1976 Cochran SR-60? Prompting calculator -
3984816 TI May 22, 1972 October 5, 1976 Cochran TMS0200/TMS0300 family Expandable function electronic calculator -
3986185 TI December 23, 1974 October 12, 1976 Bylander ? Gas discharge display with control cells -
3987416 TI September 24, 1973 October 19, 1976 Vandierendonck TMS0800 family Electronic calculator with display and keyboard scanning signal generator in data memory Calculator chip with display and keyboard matrix scanning
3988604 TI November 19, 1974 October 26, 1976 Raymond TMS1000 family Electronic calculator or digital processor chip having multiple function arithmetic unit output -
3989939 TI November 19, 1974 November 2, 1976 Raymond TMS1000 family Electronic calculator or digital processor chip with combined functions for constant, keyboard and control bit -
3991305 TI November 19, 1974 November 9, 1976 Caudel TMS1000 family Electronic calculator or digital processor chip with multiple code combinations of display and keyboard scan outputs -
3991306 TI November 19, 1974 November 9, 1976 Raymond TMS1000 family Electronic calculator or digital processor chip with separately controllable digit and segment outputs -
3995128 TI January 10, 1975 November 30, 1976 Hawkins ? Pushbutton keyboard system having preformed recessed support with contacts mounted on face and in recesses -
3996427 TI January 10, 1975 December 7, 1976 Kaminski ? Pushbutton keyboard system and method of making same -
4000393 TI August 29, 1974 December 28, 1976 Cochran - Thermal printhead assembly -
4004280 TI June 11, 1973 January 18, 1977 Vandierendonck TMS0200/TMS0300 family 16-digit 10-register chip Calculator data storage system -
4005293 TI November 29, 1974 January 25, 1977 Boulanger plastic bkpl kbd Pushbutton keyboard switch assembly having individual concave-convex contacts integrally attached to conductor strips Plastic backplane keyboard
4005299 TI April 29, 1974 January 25, 1977 Keough Klixon? Electrical contact member having low electrical resistance -
4005928 TI June 1, 1971 February 1, 1977 Kmetz ? Nematic liquid crystal displays for low voltage direct current operation -
4006455 TI October 10, 1975 February 1, 1977 Hamilton SR-60 Error correction system in a programmable calculator -
4014012 TI April 7, 1975 March 22, 1977 Caudel TI-1200/TMS0952 Segment scanning method for calculator display system Direct drive calculator chip using sequential segment scanning technique (as opposed to the more common sequential digit scanning)
4014013 TI April 7, 1975 March 22, 1977 McElroy TI-1200/TMS0952 Direct drive display system for mos integrated circuits using segment scanning Direct drive calculator chip using sequential segment scanning technique (as opposed to the more common sequential digit scanning)
4020465 TI December 26, 1973 April 26, 1977 Cochran SR-60? Thermal line printer -
4021656 TI November 19, 1974 May 3, 1977 Caudel TMS1000 family Data input for electronic calculator or digital processor chip -
4021781 TI November 19, 1974 May 3, 1977 Caudel TMS1000 family Virtual ground read-only-memory for electronic calculator or digital processor -
4024386 TI November 19, 1974 May 17, 1977 Caudel TMS1000 family Electronic calculator or digital processor chip having test mode of operation -
4037090 TI November 19, 1974 July 19, 1977 Raymond TMS1000 family Multiphase clocking for mos -
4038535 TI January 5, 1976 July 26, 1977 Aldridge PC-100 Calculator-printer cradle system Print cradle for scientific calculators
4046981 TI December 24, 1975 September 6, 1977 Johnson ? Keyboard switch with printed wiring board structure and its method of manufacture -
4048624 TI September 13, 1973 September 13, 1977 Cochran SR-50/51 Calculator system having multi-function memory instruction register -
4053795 TI July 6, 1976 October 11, 1977 Cochran SR-52? Low level field effect transistor amplifier Card reader amplifier
4059826 TI December 29, 1975 November 22, 1977 Rogers TMS0100 family Semiconductor memory array with field effect transistors programmable by alteration of threshold voltage MOS mask programmable ROM
4064554 TI August 16, 1976 December 20, 1977 Tubbs TI-30/TMC0981 Microcomputer with code conversion -
4068369 TI January 10, 1975 January 17, 1978 Kaminski ? Method of making pushbutton keyboard system -
4073006 TI July 19, 1976 February 7, 1978 Tubbs TI-30/TMC0981 Digital processor system with simultaneous branch and op code function -
4074088 TI May 21, 1974 February 14, 1978 Keough ? Keyboard apparatus and method of making -
4074351 TI July 19, 1971 February 14, 1978 Boone TMS1802 Variable function programmed calculator Includes source and object code
4074355 TI August 16, 1976 February 14, 1978 Tubbs TI-30/TMC0981 Digital microprocessor system with shared decode -
4074419 TI March 16, 1976 February 21, 1978 Hanni - Printed wiring board with angled portion and its method of manufacture PCB base is metal plate with insulating layer and then conductive traces; metal plate can be bent such as to angle the display (related 4109298, 3934334)
4078251 TI October 27, 1976 March 7, 1978 Hamilton TI-57 Electronic calculator or microprocessor with mask logic effective during data exchange operation Includes object code
4079459 TI October 27, 1976 March 14, 1978 Grant TI-57 Two speed shift register for electronic calculator or microprocessor system Includes object code
4081898 TI April 19, 1976 April 4, 1978 Taylor - Method of manufacturing an electronic calculator utilizing a flexible carrier (unrecognized)
4082966 TI December 27, 1976 April 4, 1978 Lou - MOS detector or sensing circuit Circuit for reading keyboard inputs or ROMS where signal may not be switched to a full logic level
4084173 TI July 23, 1976 April 11, 1978 Fantechi SR-52 Interdigitated transistor pair MOS FET transistors used in magnetic card reader amplifier
4089062 TI June 28, 1976 May 9, 1978 McElroy TI-30/TMC0981 Switching control circuits for electronic calculator with push-button on-off system -
4092527 TI January 31, 1977 May 30, 1978 Luecke Able-IV Calculator with interchangeable keyset -
4100600 TI October 27, 1976 July 11, 1978 Miles TI-57 Data display system for electronic calculator or microprocessor Includes object code
4100606 TI February 9, 1977 July 11, 1978 Brantingham TI-1050/TMS0920 Key debounce system for electronic calculator or microprocessor With source code
4107781 TI October 27, 1976 August 15, 1978 Barrett TI-57 Electronic calculator or microprocessor with indirect addressing Includes object code
4107782 TI October 10, 1975 August 15, 1978 Cochran SR-60 Prompting programmable calculator -
4112495 TI February 9, 1977 September 5, 1978 Easley TI-1050/TMS0920 Electronic calculator or microprocessor having a selectively loadable instruction register Includes source code
4115705 TI June 14, 1976 September 19, 1978 McElroy TI-30/TMC0981 Electronic calculator with push-button on-off system Calculator with ON and OFF keys, such as the TI-30
4118858 TI April 19, 1976 October 10, 1978 Taylor - Method of making an electronic calculator (unrecognized)
4121760 TI December 28, 1973 October 24, 1978 Cochran SR-22 (TMS0207, TMS0323, TMS0404) Electronic multibase calculator Includes object code
4123627 TI December 6, 1976 October 31, 1978 Boulanger plastic bkpl kbd Keyboard apparatus Plastic backplane keyboard
4125830 TI December 26, 1973 November 14, 1978 Cochran SR-60? Alphanumeric display system -
4125867 TI October 27, 1976 November 14, 1978 Cochran TI-57 Electronic calculator or microprocessor having a hexadecimal/binary coded decimal arithmetic unit Includes object code
4125901 TI October 27, 1976 November 14, 1978 Merrow TI-57 Electronic calculator or microprocessor having a multi-input arithmetic unit Includes object code
4125934 TI May 21, 1974 November 21, 1978 Keough ? Keyboard apparatus and method of making -
4139893 TI August 16, 1976 February 13, 1979 Poland TI-58/59 SSSW & mag crd Calculator program security system -
4141075 TI April 19, 1976 February 20, 1979 Taylor - Method of making an electronic calculator (unrecognized)
4145756 TI December 26, 1973 March 20, 1979 Cochran SR-60? Thermal line printer Incorporates 4,020,465 by reference
4146928 TI October 27, 1976 March 27, 1979 Miles TI-57 Power up clear system for an electronic calculator or microprocessor Includes object code
4153937 TI August 16, 1976 May 8, 1979 Poland TI-58/59 SSSW Microprocessor system having high order capability Microprocessor based calculator with internal ROM and user replaceable ROM; includes object code
4153987 TI December 9, 1974 May 15, 1979 Boulanger ? Method for assembling keyboard -
4156927 TI August 11, 1976 May 29, 1979 McElroy TI-30/TMC0981 Digital processor system with direct access memory -
4158431 TI December 10, 1976 June 19, 1979 vanBavel TMS0100 family Self-test feature for appliances or electronic systems operated by microprocessor -
4158432 TI December 10, 1976 June 19, 1979 vanBavel TMS0100 family Control of self-test feature for appliances or electronic equipment operated by microprocessor -
4164031 TI November 26, 1976 August 7, 1979 Lou ? Memory system -
4164037 TI October 27, 1976 August 7, 1979 Cochran TI-57 Electronic calculator or microprocessor system having combined data and flag bit storage system Includes object code
4170422 TI February 3, 1975 October 9, 1979 Bilek TI-5050? Printhead alignment mechanism -
4175286 TI January 19, 1978 November 20, 1979 Hunter TI-5015/TMS1118 Burn-in test system for electronic apparatus With source code, describes specific key combination for self-test burn-in
4179746 TI July 19, 1976 December 18, 1979 Tubbs TI-30/TMC0981 Digital processor system with conditional carry and status function in arithmetic unit -
4181964 TI July 2, 1975 January 1, 1980 Moore - Integrated electronics assembly on a plastic chassis (unrecognized)
4188626 TI May 23, 1977 February 12, 1980 Frantz 1st gen LCD? Method for scanning a keyboard and for actuating a display device via common conductors -
4190897 TI January 1, 1977 February 26, 1980 Someshwar TI-58/59 SSSW Binary coded decimal addressed read-only-memory -
4200926 TI May 22, 1972 April 29, 1980 Cochran TMS0200/TMS0300 family Electronic calculator implemented in semiconductor lsi chips with scanned keyboard and display Includes source and object code
4208720 TI July 26, 1976 June 17, 1980 Harrison AOS Calculator with algebraic operating system Algebraic logic Operating System (AOS); includes source code
4209836 TI July 17, 1977 June 24, 1980 Wiggins Speak&Spell Speech synthesis integrated circuit device -
4216522 TI June 6, 1977 August 5, 1980 Slagel TI-58/59 SSSW Interchangeable module for integrated circuits Solid-State-Software ROM module
4224615 TI September 14, 1978 September 23, 1980 Penz - Method of using a liquid crystal display device as a data input device (unrecognized)
4242675 TI July 19, 1971 December 30, 1980 Boone TMS1802 Display and keyboard scanning for electronic calculation or the like Includes source and object code (almost unreadable)
4242735 TI December 28, 1973 December 30, 1980 Sexton TMS0200/TMS0300 family Calculator-printer interface with numerical string segmentation -
4254309 TI April 19, 1976 March 3, 1981 Johnson ? Snap-through characteristic keyboard switch -
4258429 TI November 19, 1974 March 24, 1981 Raymond TMS1000 family Multiphase clocking for mos electronic calculator or digital processor chip -
4264963 TI June 8, 1979 April 28, 1981 Leach 1st gen LCD, TI-50 Static latches for storing display segment information -
4267578 TI August 26, 1974 May 12, 1981 Vetter - Calculator system with anti-theft feature Use of PIN; unrecognized
4277675 TI October 27, 1976 July 7, 1981 Mar TI-57? Non-sequential counter Includes object code
4277827 TI January 2, 1979 July 7, 1981 Carlson TI-58/59 SSSW Microprocessor based system for the development and emulation of programmable calculator control read only memory software -
4282597 TI November 28, 1977 August 4, 1981 Yenawine Digital Watch Metal-coated plastic housing for electronic components and the method of making same (watch case) -
4287559 TI February 9, 1977 September 1, 1981 Easley TI-1050/TMS0920 Electronic microprocessor system having two cycle branch logic With source code
4290121 TI July 19, 1971 September 15, 1981 Boone TMS1802 Variable function programmed calculator -
4295181 TI January 15, 1979 October 13, 1981 Chang Speak & Spell Module for an integrated circuit system Educational
4298949 TI August 16, 1976 November 3, 1981 Poland TI-58/59 SSSW Electronic calculator system having high order math capability -
4308017 TI January 6, 1979 December 29, 1981 Laughon Spelling B Electronic learning aid with picture book Educational word game utilizes calculator architecture
4317180 TI December 26, 1979 February 23, 1982 Lies 1st gen LCD, TI-50 Clocked logic low power standby mode -
4317181 TI December 26, 1979 February 23, 1982 Teza 1st gen LCD, TI-50 Four mode microcomputer power save operation -
4326265 TI July 19, 1971 April 20, 1982 Boone TMS1802 Variable function programmed calculator -
4327953 TI June 6, 1977 May 4, 1982 Slagel TI-58/59 SSSW Interchangeable module for integrated circuits Solid-State-Software ROM module
4335275 TI April 28, 1978 June 15, 1982 Brantingham Speak&Spell Synchronous method and apparatus for speech synthesis circuit -
4340374 TI October 7, 1977 July 20, 1982 Culley Dataman Electronic learning aid -
4340871 TI September 14, 1979 July 20, 1982 Teza 1st gen LCD, TI-50 Low power oscillator having clamping transistors across its timing capacitors -
4342094 TI July 19, 1971 July 27, 1982 Boone TMS1802 Display method for variable function programed system -
4344148 TI June 17, 1977 August 10, 1982 Brantingham Speak&Spell System using digital filter for waveform or speech synthesis -
4348733 TI July 26, 1976 September 7, 1982 Harrison AOS Calculator with algebraic operating system Algebraic logic Operating System (AOS); includes source code
4352963 TI August 5, 1980 October 5, 1982 De Filippis - Low profile microswitches, particularly useful for the composition of keyboards and methods of making Low cost snap-disk keyboard construction
4354068 TI February 4, 1980 October 12, 1982 Sobol - Long travel elastomer keyboard (various non-handheld keyboards)
4360716 TI October 1, 1980 November 23, 1982 Fiorella ? Area actuated switch array Educational
4361873 TI June 11, 1979 November 30, 1982 Harper 1st gen LCD, TI-50 Calculator with constant memory -
4369498 TI January 19, 1981 January 18, 1983 Schulte - Photoluminescent powered calculator (not sold)
4380371 TI May 23, 1977 April 19, 1983 Frantz 1st gen LCD? Liquid crystal display device -
4383184 TI January 26, 1980 May 10, 1983 McFarland TI-88 Power controller -
4385366 TI September 2, 1980 May 24, 1983 Housey - Programmable device using selectively connectible memory module to simultaneously define the functional capability and the display associated with input switches ROM cartridges have key legends visible through thin/transparent keyboard
4409665 TI December 26, 1979 October 11, 1983 Tubbs 1st gen LCD, TI-50 Turn-off-processor between keystrokes -
4411628 TI September 11, 1981 October 25, 1983 Laughon Spelling B Electronic learning aid with picture book Educational word game utilizes calculator architecture
4418397 TI May 29, 1980 November 29, 1983 Brantingham TI-88 Address decode system -
4421487 TI October 7, 1981 December 20, 1983 Laughon Mr Challenger Electronic learning aid and game Educational word game utilizes calculator architecture
4430584 TI May 29, 1980 February 7, 1984 Someshwar TI-88 Modular input/output system -
4430724 TI June 26, 1980 February 7, 1984 Hamilton TI-88 Memory interface system having combined command, address and data bus -
4435775 TI January 19, 1981 March 6, 1984 Brantingham TI-88 Data processing system having interlinked slow and fast memory means -
4443845 TI June 26, 1980 April 17, 1984 Hamilton TI-88 Memory system having a common interface -
4447881 TI May 29, 1980 May 8, 1984 Brantingham TI-88 Data processing system integrated circuit having modular memory add-on capacity -
4454591 TI May 29, 1980 June 12, 1984 Lou TI-88 Interface system for bus line controller -
4459565 TI June 9, 1980 June 10, 1984 Leach - Low current electronic oscillator system -
4471460 TI July 19, 1971 September 11, 1984 Boone TMS1802 Variable function programmed system -
4471461 TI July 19, 1971 September 11, 1984 Boone TMS1802 Variable function programmed system -
4473886 TI July 6, 1981 September 25, 1984 Rizk TI-55II Data processing apparatus with algebraic memory operation and entry sequence -
4475165 TI July 6, 1981 October 2, 1984 Rizk TI-55II Method of data entry and execution of a two variable calculator function in the same manner and entry format as a single variable function -
4476541 TI July 19, 1971 October 9, 1984 Boone TMS1802 Variable function programmed system -
4484261 TI January 19, 1981 November 20, 1984 Brantingham TI-88 Data processing system having interlinked fast and slow memory means and interlinked program counters -
4485455 TI July 19, 1971 November 27, 1984 Boone TMS1802 Single-chip semiconductor unit and key input for variable function programmed system -
4491938 TI December 28, 1981 January 1, 1985 Leach TMS0100 family Low voltage RAM cell -
4495426 TI December 24, 1981 January 22, 1985 Leach TMS0100 family Low power inverter circuit -
4495592 TI May 25, 1982 January 22, 1985 Caldwell TI-88/EOS? Electronic data processing apparatus with equation operating system having implied multiplication of two hierarchical ranks -
4503494 TI June 26, 1980 March 5, 1985 Hamilton TI-88 Non-volatile memory system -
4507745 TI December 21, 1981 March 26, 1985 Agrawal - Data processing apparatus having alterable interest rate mode capability (unrecognized, not BA-55)
4516218 TI June 26, 1980 May 7, 1985 Hamilton TI-88 Memory system with single command selective sequential accessing of predetermined pluralities of data locations -
4519045 TI May 25, 1982 May 21, 1985 Caldwell TI-88/EOS? Electronic data processing apparatus with equation operating system having improved unary operation implementation -
4521868 TI May 25, 1982 June 4, 1985 Caldwell TI-88/EOS? Electronic data processing apparatus with equation operating system having improved exponentiation operators -
4535465 TI December 24, 1981 August 13, 1985 Leach TMS0100 family Low power clock generator -
4560954 TI December 24, 1981 December 24, 1985 Leach TMS0100 family Low power oscillator circuit -
4587634 TI December 20, 1982 May 6, 1986 Ferrio CC40 Data processing apparatus for multiple mode operation as specified by user inputs -
4593279 TI December 24, 1981 June 3, 1986 Leach TMS0100 family Low power liquid crystal display driver circuit -
4598383 TI December 28, 1981 July 1, 1986 Leach TMS0100 family Combination of a data processor with a switch means Improved ON/OFF key that is part of keyboard matrix and reduces power consumption in the OFF state
4635354 TI July 22, 1982 January 13, 1987 Chrobak - Low cost electronic apparatus construction method (unrecognized)
4703160 TI June 14, 1985 October 27, 1987 Narishima - Casing structure of portable electronic appliance (unrecognized)
4724605 TI October 1, 1980 February 16, 1988 Fiorella ? Method of making area actuated switch Educational
4736190 TI November 1, 1982 April 5, 1988 Fiorella ? Sheet membrane keyboard and electronic apparatus using same Educational?
4823311 TI May 30, 1986 April 18, 1989 Hunter TI-95 Calculator keyboard with user definable function keys and with programmably alterable interactive labels for certain function keys -
4831569 TI July 23, 1984 May 16, 1989 Duriez - Display system for indicating standby operations of electronic data processing apparatus Displays pending operators for an educational calculator
4885574 TI June 19, 1985 December 5, 1989 Negishi - Display and keyboard panel (unrecognized)
4954977 TI August 12, 1988 September 4, 1990 Colombat Galaxy 9/9x/40/40x, Math Explorer/+ Pedagogic calculating machine for arithmetic instruction Calculator with zoned display for quotient and remainder results of integer divide function
5135398 TI July 31, 1990 August 4, 1992 Thornton Super Speak & Math Electronic teaching device -
5137457 TI July 31, 1990 August 11, 1992 Howard Super Speak & Math Electronic teaching device -
5139423 TI July 31, 1990 August 18, 1992 McCormack Super Speak & Math Electronic teaching device -
5168294 TI September 7, 1990 December 1, 1992 Davis Graphing overhead display Display demonstration system for providing enlarged projected image of calculator display Graphing calculator overhead projector display
5377130 TI January 26, 1993 December 27, 1994 Frank Galaxy 67, TI-82 Method and apparatus for solving terms of a numerical sequence -
5392081 TI September 29, 1993 February 21, 1995 Tarnay Graphing overhead display Calculator projection display Graphing calculator overhead projector display
5532946 TI September 29, 1993 July 2, 1996 Phipps TI-82 Calculator with table generation capability -
5870319 TI January 4, 1996 February 9, 1999 Thornton TI-92 Device and method for collecting data from graphed images -
6650317 TI July 19, 1971 November 18, 2003 Boone TMS1802 Variable function programmed calculator Includes source and object code
6704013 TI December 1, 2000 March 9, 2004 Hosea - Function graphing method with detection of discontinuities (graphing calculator)
6771252 TI December 20, 2000 August 3, 2004 Miller - Shading of inequalities on a graphing calculator (graphing calculator)
6867777 TI December 20, 2000 March 15, 2005 Miller - Tracing and storing points of interest on a graphing calculator (graphing calculator)
6874005 TI December 28, 2001 March 29, 2005 Fortenberry TI-89/92+ Subexpression selection of expression represented in contiguous tokenized polish representation (graphing calculator)
6889362 TI September 7, 2001 May 3, 2005 Wattenberg - User interface for graphical specification of functions (graphing calculator)
6891541 TI March 27, 2000 May 10, 2005 Harris - Graphing calculator with manual line drawing (graphing calculator)
6922710 TI November 8, 2001 July 26, 2005 Child TI-89/92+ Hand-held calculator with problems and operations linked lists Math tutoring software for use on a graphing calculator
6938060 TI December 27, 2001 August 30, 2005 Good TI-83 Plus Apparatus and method for graphically displaying a vector simultaneously along with the numerical values of its vector components (graphing calculator)
6956560 TI August 24, 2001 October 18, 2005 Brothers TI-89/92+ Selection of mathematical objects from the history screen on a handheld device (graphing calculator)
6968208 TI November 26, 2002 November 22, 2005 Kacines - Data storage for a portable computer device Memory or wireless transceiver in a rechargeable battery pack is used to transfer data to graphing calculators in the classroom
7042713 TI September 7, 2004 May 9, 2006 Nicolosi - Slide case with pivotable stand member for handheld computing device Slide-on cover has hinged support that can be raised to support calculator and a convenient viewing angle
H1970 TI July 19, 1971 June 5, 2001 Boone TMS1802 Variable function programmed system Includes source and object code
RE30671 TI August 16, 1976 July 7, 1981 Poland TI-58/59 SSSW Microprocessor system having high order capability Reissue of 4153937
RE31864 TI December 10, 1976 April 9, 1985 vanBavel TMS0100 family Self-test feature for appliances or electronic systems operated by microprocessor Reissue of 4158431

Notes:

1 Where multiple inventors, only first inventor's name is listed.


BACK HOME

Last updated November 5, 2006