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

Calculator Patents - Mechanical (non-Comptometer)


U.S. Patent No. Assignee File Date Issue Date Inventor1 Product Title Comments
3574 (none) (none given) May 6, 1844 Hatfield - Machine for calculating interest Lookup table imprinted on drum
4632 (none) (none given) July 14, 1846 Van Der Veer - Teaching arithmetic Table imprinted on drum with slotted sleeve for viewing results
5746 (none) (none given) September 5, 1848 Baranowski - Reckoning machine Lookup table imprinted on drum
6403 (none) (none given) May 1, 1849 Haines - Calculating machine Circular adding wheel
6602 (none) (none given) July 24, 1849 Young - Calculating machine Sliding bar adder
7074 (none) (none given) February 5, 1850 Parmelee - Calculating machine Sum indicated on a single racheted rod, key movement restricted to number of notches for value
7331 (none) (none given) April 30, 1850 Van Der Veer - Board and log rule Lookup table imprinted on drum placed inside common octangular board rule or measure used with lumbermen
8329 (none) (none given) September 2, 1851 Young - Rules for calculating interest Sliding bars with replaceable cards for computing tax or interest
11726 (none) (none given) September 26, 1854 Hatfield - Machine for adding numbers Circular adding wheel
13800 (none) (none given) November 13, 1855 Saxton - Machine for adding numbers Circular adding wheel with numbers in a spiral
15565 (none) (none given) August 19, 1856 Hubbs - Machine for adding numbers Circular adding wheel with numbers in a spiral
18675 (none) (none given) November 24, 1857 Castle - Improved arithmometer for adding -
18692 (none) (none given) November 24, 1857 Hill - Improved arithmometer -
18711 (none) (none given) November 24, 1857 Smith - Machine for multiplying numbers Lookup table on disk
21236 (none) (none given) August 17, 1858 Nutz - Improvement in addometers Chain adder with keys
21243 (none) (none given) August 24, 1858 Burns - Addometer Disk adding machine
21621 (none) (none given) September 28, 1858 Newbrough - Machine for adding numbers Circular adding wheel
21921 (none) (none given) October 26, 1858 Young - Arithmetical proof rule Sliding bar adder
21941 (none) (none given) November 2, 1858 Castle - Improved arithmometer for addition Keyed adder
23637 (none) (none given) April 12, 1859 Winter - Improved adding-machine Keyed counter
24481 (none) (none given) June 21, 1859 Newbrough - Instrument for adding numbers Circular adding wheel
24990 (none) (none given) August 9, 1859 Campbell - Adding machine Addometer with carry
27418 (none) (none given) March 13, 1860 Ballou - Adding machine Disk adding machine
28006 (none) (none given) April 24, 1860 Nelson - Machine for adding numbers Keyed counter
30264 (none) (none given) October 2, 1860 Strode - Adding machine Addometer with sliding guides to facilitate reading numbers from ledger
31016 (none) (none given) January 1, 1861 Harris - Adding machine Disk adding machine
38374 (none) (none given) May 5, 1863 Crane - Improvement in tax calculators Lookup tables
39222 (none) (none given) July 14, 1863 Fowler - Improvement in adding machines Sliding bar adder
40105 (none) (none given) September 29, 1863 Jeffers - Improvement in adding machines Disk adding machine with improved carry mechanism
41898 (none) (none given) March 15, 1864 Alexander - Improvement in calculating machines Disk adding machine with levers to move disks, and display drums for addition and subtraction results
45482 (none) (none given) December 20, 1864 Dolbeer - Improvement in machines for counting Circular adding wheel
49168 (none) (none given) August 1, 1865 Strode - Improvement in adding machines Circular adding wheel
51972 (none) (none given) January 9, 1866 Rowland - Improvement in calculating machines Circular adding wheel
58347 Samuel J. Kelso (inventor) & James Edgar (none given) September 25, 1866 Kelso - Improvement in ciphering machines Addometer with half-circle slots, and slide counter to assist with multiplication
60475 (none) (none given) December 18, 1866 Chidester - Improvement in computing machines Disk adding machine
62677 (none) (none given) March 5, 1867 Parks - Improvement in adding machines Two disk adder
62882 (none) (none given) March 12, 1867 Pierson - Improvement in calculating machines Interest calculator using lookup tables printed on polygonal cylinders
65883 (none) (none given) June 18, 1867 Davies - Improvement in computing machines Chain adder
67786 (none) (none given) August 13, 1867 Mendenhall - Improvement in calculating machines ?
69647 (none) (none given) October 8, 1867 Farmer - Improvement in tallying instrument Circular adding wheels
70926 (none) (none given) November 12, 1867 White - Improvement in wages indicators Wage calculations with lookup table on a cylinder
73449 (none) (none given) January 6, 1868 Keiler - Improvement in calculating machines Circular adding disk on threaded shaft; position on shaft indicates hundreds
73732 James A Loomis (inventor), Alonzo Johnson (inventor), & Charles Gifferd (none given) January 28, 1868 Loomis - Improvement in calculating machines Circular adding wheel
73995 (none) (none given) February 4, 1868 Pierson - Improvement in calculating machines Lookup table with sliding guide and aperture
74170 (none) (none given) February 4, 1868 Strode - Calculating and registering machine Circular adding wheel
74641 (none) (none given) February 14, 1868 Wallworth - Improvement in computing apparatus Multiplication lookup table on disk
75322 (none) (none given) March 10, 1868 Webb - Improvement in calculating-apparatus Circular wheel adder
77736 (none) (none given) May 12, 1868 Hyatt - Improvement in tax calculators Lookup table with sliding guide
79209 (none) (none given) June 23, 1868 Corliss - Improvement in instruments for adding figures Almost a pen calculator stylus adder
79272 Charles Corless (co-inventor) (none given) June 23, 1868 Spofford - Improvement in instruments for adding and registering numbers Almost a pen calculator stylus adder
85229 Sylvester Bissell and Andrew B. West (none given) December 22, 1868 Johnson - Improvement in calculating-apparatus Circular wheel adder
90275 (none) (none given) May 18, 1869 Kummer - Improvement in computing tablet Sliding bar adder claims carry guides and slotted sides to bar
94772 (none) (none given) September 14, 1868 Reffelt - Improvement in calculating machine Circular adding wheel, with multiplication lookup table on reverse side
95876 (none) (none given) October 19, 1869 Brown - Improvement in adding machines Keyed circular adding wheel
97974 (none) (none given) December 14, 1869 Sinclair - Improvement in price calculating devices Lookup table on drum
98720 (none) (none given) January 11, 1870 Swain - Improvement in adding machine Disk adding machine
99533 (none) (none given) February 8, 1870 Chapin - Adding machine -
100288 (none) (none given) March 1, 1870 Groesbeck - Improvement in adding machines Addometer style adder with 1/3-circle slots
106701 Frank T. Leilich (inventor) & Michael Leilich (none given) August 23, 1870 Leilich - Improvement in adding machines Disk adding machine
106881 Eugene Humphrey (none given) August 30, 1870 Spear - Improvement in adding machine Sliding bar adder
106999 (none) (none given) September 6, 1870 Chapin - Improvement in adding machines Disk adding machine with scalloped disks for finger use
109619 (none) (none given) November 29, 1870 House - Improvement in adding and subtracting registers Circular adding wheel
110520 (none) (none given) December 27, 1870 Warner - Improvement in adding machines Circular adding wheel
117169 (none) (none given) July 18, 1871 Hamilton - Improvement in adding machines Adder
121687 (none) (none given) December 5, 1871 Teasdale - Improvement in calculating machines Disk adding machine with crank
129335 (none) (none given) July 16, 1872 Grant - Improvement in calculating-machines Device capable of multiplication or division by successive addition or subtraction
129531 (none) (none given) July 16, 1872 Coldwell - Improvement in interest calculators Lookup table on disk
130244 (none) (none given) August 6, 1872 Robjohn - Improvement in calculating-machines Key locking mechanism
130404 (none) (none given) August 13, 1872 Barbour - Improvement in calculating-machines -
133188 (none) (none given) November 19, 1872 Barbour - Improvement in calculating-machines Simplification to 130,404
137107 (none) (none given) March 25, 1873 Stephenson - Improvement in adding machines Addometer with carry
138245 (none) December 30, 1872 April 29, 1873 Grant - Improvement in calculating-machines Improvement to 129,335
140146 (none) August 11, 1871 June 24, 1873 Linderoos - Improvement in adding machines Circular adding wheel
143184 (none) June 13, 1873 September 23, 1873 Pool - Improvement in adding machines Adding machine with concentric rings
144523 (none) August 21, 1873 November 11, 1873 Esersky - Improvement in calculating machines Abacus like device
146407 (none) June 7, 1873 January 13, 1874 Spalding - Improvement in adding machines Adding wheel with key entry
150973 (none) December 6, 1873 May 19, 1874 Pettibone - Improvement in tax calculators Lookup table on disk
152670 (none) April 25, 1874 June 30, 1874 Moore - Improvement in adding machines Addometer mechanical improvements
153522 (none) April 1, 1874 July 28, 1874 Baldwin - Improvement in adding machines -
153826 (none) April 21, 1874 August 4, 1874 Holman - Improvement in adding machines Adding wheel
155772 Elmore W. Taylor (inventor) and Richard T. Taylor May 21, 1874 October 6, 1874 Taylor - Improvement in adding machines Circular adding wheel
157690 (none) May 19, 1874 December 15, 1874 Lawrence - Improvement in adding machines Adder where values to be added are entered by pulling on tapes/bands
158853 (none) June 10, 1873 January 19, 1875 Martin - Improvement in mechanical calculators Moving bar adder with coupled lookup table
159244 (none) September 8, 1873 February 2, 1875 Baldwin - Improvement in calculating-machines -
165964 Alfred C. Wellman (inventor) and B.W. Griffin February 15, 1875 July 27, 1875 Wellman - Improvement in calculators Chain driven arithmometer-type adding/display mechanism
168080 (none) February 1, 1873 September 28, 1875 Barbour - Improvement in calculating machines Four-function with printing
170708 (none) November 30, 1874 December 7, 1876 Butt - Improvement in adding machines Circular wheel adder
172270 (none) August 6, 1875 January 18, 1876 Kilbourn - Improvement of calculators for manufacturers of picture frames -
207918 (none) July 5, 1878 September 10, 1878 Verea - Improvement in calculating-machines -
209416 Konigss-Berger & Co. July 13, 1878 October 29, 1878 Odhner - Improvement in calculating-machines Four functions
251823 Bennett D. Mattingly, half-interest March 31, 1881 January 3, 1882 Bouchet - Adding machine Adding mechanism improvements
293809 (none) October 10, 1883 February 19, 1884 Spalding - Adding machine Sums indicated with dials
308528 L.W. Noyes October 18, 1883 November 25, 1884 Stark - Adding machine -
312014 (none) July 4, 1883 February 10, 1885 Pottin - Recording and registering apparatus for tills Cash register
314561 M.F. Madden, one-third assignment April 4, 1884 March 31, 1885 Bouchet - Adding machine Adding mechanism improvement utilizing curved rack-bars and toothed roller
384373 (none) March 26, 1887 June 12, 1888 Ludlum - Adding and writing machine Adding machine with mechanical typewriter-like print mechanism
414959 (none) April 28, 1888 November 12, 1889 Webb - Adding machine Circular wheel adder
420667 (none) April 12, 1886 February 4, 1890 Selling - Calculating machine Calculating mechanism
538710 (none) December 23, 1892 May 7, 1895 Steiger - Multiplying or dividing machine Direct multiplication/division instead of repetative addition/subtraction
556720 (none) September 30, 1889 March 17, 1896 Bollee - Calculating machine Four functions
622470 (none) March 2, 1895 April 4, 1899 Hollerith - Adding and recording machine -
654181 Universal Accountant Machine Co. April 2, 1900 July 24, 1900 Rinsche - Calculating machine Printing adding machine
703188 American Mechanical Cashier Co. March 9, 1900 June 24, 1902 Dement - Cash register Improvements
703330 (none) March 13, 1902 June 24, 1902 Wiswall - Adding machine Mechanical adder, looks like a Comptometer but is not one
703785 Paul Haack July 2, 1900 July 1, 1902 Hamann - Calculating machine -
706375 (none) November 26, 1901 August 5, 1902 Baldwin - Calculating machine Multiplication and division
720086 Mechanical Accountant Co. June 17, 1901 February 10, 1903 Turck - Calculating machine Not a Comptometer product
726803 Universal Accountant Machine Co. May 9, 1901 April 28, 1903 Rinsche - Calculating machine Keyboard locking during calculation, dual-color ribbon
765774 (none) October 1, 1900 July 26, 1904 Goldberg - Calculating machine Shows entered number before added to allow correction
789099 (none) February 7, 1901 May 2, 1905 Lockwood - Adding machine Printing adding machine
809075 Keuffel & Esser Co. June 29, 1901 January 2, 1906 Rechnitzer - Calculator -
817450 Walter L. Milliken, one-half interest September 1, 1904 April 10, 1906 Shiek - Computing machine Partially depressed key locks keyboard until key fully depressed
823219 (none) October 20, 1903 June 12, 1906 Hensley - Calculating machine Financial calculator to calculate daily interest and exchange problems
823375 (none) February 2, 1905 June 12, 1906 Trinks - Calculating machine Mechanical adder with rotatable disks, operating handle locked until disks are zeroed
832666 (none) March 28, 1905 October 9, 1906 Hamann - Calculating machine -
890888 (none) January 24, 1907 June 16, 1908 Baldwin - Calculating and recording machine Improved printing calculator
938790 (none) March 29, 1909 November 2, 1909 Rein - Calculating machine Selective resetting of feedwheels to zero with single operation of handle
972360 (none) October 11, 1910 October 11, 1910 Graber - Calculating machine Automatically perform four functions
1011156 (none) June 29, 1911 December 12, 1911 Chase - Registering mechanism for calculating machine Not a Comptometer product
1011617 Mercedes Bureau-Maschinen Gesellschaft, M.B.H June 28, 1910 December 12, 1911 Hamann - Calculating machine -
1034565 Austin Adding Machine Corp. March 31, 1910 August 6, 1912 Austin - Adding, subtracting, and multiplying machine -
1136391 Frederic L Huidekoper, Trustee of Washington, D.C. August 28, 1911 April 20, 1915 Austin - Calculating machine Improvements to 3-function mechanism of 1,034,565
1198487 Rockford Milling Machine Co. March 14, 1914 September 19, 1916 Sundstrand - Adding and listing machine -
1292513 Autarit-Gesellschaft, M.B.H. July 17, 1905 January 28, 1919 Rechnitzer - Calculator Continuous motor drive operation
1294507 National Cash Register Co. April 15, 1914 February 18, 1919 Martin - Registering machine Direct subtraction, as distinguished from adding complements
1297711 Mays Accounting Machine Co. April 30, 1917 March 18, 1919 Mays - Quotient registering mechanism for calculating machines -
1329028 Rockford Milling Machine Co. March 11, 1912 January 27, 1920 Sundstrand - Listing and adding machine Mechanical simplification
1329262 (none) March 20, 1915 January 27, 1920 Chase - Calculating machine Not Comptometer - improved dual-register mechanism
1409575 (none) July 26, 1912 March 14, 1922 Rechnitzer - Calculating machine Starts multiplication as soon as entry of multiplier number begins
1455555 Rockford Milling Machine Co. March 11, 1912 May 15, 1923 Sundstrand - Adding machine Printer mechanism improvements, printing annotations
1474230 Monroe Calculating Machine Co. November 23, 1920 November 13, 1923 Britten - Calculating machine Improved operation of the crank handle
1481487 Rockford Milling Machine Co. August 15, 1921 January 22, 1924 Sundstrand - Adding and listing machine Printing adding machine with ability to print annotations
1520438 (none) July 27, 1922 December 23, 1924 Pothig - Calculating machine -
1528018 Mercedes Buromaschinen Und Waffenwerke February 16, 1918 March 3, 1925 Hamann - Combined typewriting and counting machine -
1533119 Powers Accounting Machine Corp. December 24, 1917 April 14, 1925 Lasker - Cipher cut-out mechanism Leading zero suppression for printing numbers
1534242 (none) November 2, 1922 April 21, 1925 Odhner - Calculating machine Eliminate springs in mechanism to return wheels to inactive positions
1544806 Monroe Calculating Machine Co. January 16, 1922 July 7, 1925 Chase - Full-cycle stop for calculating machine Full-cycle stop for hand crank
1566650 Monroe Calculating Machine Co. November 21, 1922 December 22, 1925 Chase - Operating means for calculator Reversing mechanism for negative calculations
1583102 Rockford Milling Machine Co. September 13, 1920 May 4, 1926 Sundstrand - Adding and listing machine Printing mechanism
1643710 (none) February 18, 1924 September 27, 1927 Friden - Calculating machine Multiplication and division by depression of a key
1839138 Fried Krupp Aktiengesellschaft February 25, 1924 December 29, 1931 Breitling - Bookkeeping machine -
1845863 Monroe Calculating Machine Co. May 29, 1930 February 16, 1932 Chase - Calculating machine Elimination of passive registration phase of a motor driven reversible cycle calculating machine
1888161 Monroe Calculating Machine Co. January 7, 1926 November 15, 1932 Chase - Automatic control for calculating machines Utilizes either build up or tear down method for division calculations
1964211 Monroe Calculating Machine Co. September 22, 1932 June 26, 1934 Overbury - Calculating machine Transfer of register contents to allow use of result in subsequent calculation
2009010 Marchant Calculating Machine Co. March 30, 1927 July 23, 1935 Friden - Calculating machine -
2019900 IBM October 21, 1930 November 5, 1935 Fuller - Accounting machine Improved mechanism with error correction for ten-key adder
2058922 Underwood Elliott Fisher Co. August 29, 1933 October 27, 1936 Stickney - Computing machine Multi-zero entry keys (e.g. 000)
2061362 Underwood Elliott Fisher Co. March 16, 1934 November 17, 1936 Lentz - Computing machine Multi-zero entry keys (e.g. 000)
2100213 Victor Adding Machine Co. December 28, 1935 November 23, 1937 Garbell - Printing mechanism Printer for adding machine accepts a card
2108596 (none) July 17, 1929 February 15, 1938 Rudin - Calculating machine Odner/pinwheel adding machine
2153299 Kooperativa Forbundet Forening u.p.a. May 22, 1935 April 4, 1939 Dahlberg - Tens transmitting device for calculating machines and the like Tens-carry
2201713 Monroe Calculating Machine Co. September 30, 1939 May 21, 1940 Britten - Calculating machine Improved multiplication mechanism
2211736 Marchant Calculating Machine Co. December 18, 1933 August 13, 1940 Avery - Calculating machine Mechanical improvements to eliminate carriage overshoot and reduce operating noise
2214029 Remington Rand Inc. April 25, 1936 September 10, 1940 Mixer - Calculating machine Mechanical accounting machine with card reader/punch that multiplies numbers on the cards and punches the result on the card
2216659 Marchant Calculating Machine Co. June 12, 1936 October 1, 1940 Avery - Calculating machine -
2294083 Friden Calculating Machine Co., Inc. November 14, 1938 August 25, 1942 Friden - Calculating machine Powered register zero/reset
2311454 Remington Rand Inc. April 25, 1936 February 16, 1943 Mixer - Accounting machine Method of zeroing accumulator wheels of the 2214029 machine
2349769 Underwood Elliott Fisher Co. November 3, 1941 May 23, 1944 Sundstrand - Printing mechanism for adding and accounting machines Dual ribbon mechanism for printing two copies
2379877 Monroe Calculating Machine Co. November 13, 1941 July 10, 1945 Britten - Calculating machine Improved mechanical multiplication/division utilizing short-cuts to reduce computing time
2419760 Monroe Calculating Machine Co. July 13, 1945 April 29, 1947 Britten - Operation control means for calculating machines -
2427271 Friden Calculating Machine Co., Inc. October 27, 1941 September 9, 1947 Friden - Multiplier correction mechanism -
2525352 (none) March 7, 1946 October 10, 1950 Herzstark Curta Calculating machine -
2533372 (none) May 15, 1946 December 12, 1950 Herzstark Curta Zeroizing mechanism -
2538896 Monroe Calculating Machine Co. July 13, 1945 January 23, 1951 Britten - Multiplier magazine -
2544426 Contina Buro-und Rechenmachinenfabrik A.G. May 15, 1946 March 6, 1951 Herzstark Curta Visible setting control mechanism for calculating machines -
2566835 Contina Bureaux-und Rechenmaschinenfabrik Aktiengesellschaft April 27, 1950 September 4, 1951 Herzstark Curta Locking device Crank lock
2583810 Clary Multiplier Corp. March 13, 1945 January 29, 1952 Boyden - Accumulator state control positioning mechanism -
2681765 Friden Calculating Machine Co., Inc. November 7, 1949 June 22, 1954 Hopkins - Value indexing machine -
2794592 Powers-Samas Accounting Machines Ltd. May 26, 1953 June 4, 1957 Excell - Accumulator mechanism -
2826366 Olivetti January 10, 1955 March 11, 1958 Capellaro - Transfer mechanism for computing machines Tens-carry
2832283 Olympia Werke A.G. May 23, 1955 April 29, 1958 Westinger - Selecting and actuating means for arcuate type carriers Print elements in an arc to improve printing speed
2917231 Clary Corp. May 14, 1956 December 15, 1959 Stansell - Advancing-retracting means for calculating machine pin carriage -
2942776 Underwood Corp. December 29, 1955 June 28, 1960 Anderson - Actuating mechanism for ten key adding machine Increase mechanism speed by driving as many parts of the mechanism as possible by motor, eliminating springs
2945622 Precisia A.G. February 11, 1955 July 19, 1960 Heinze - Ten-keys keyboard for calculating machines Mechanical improvements
2992773 Olivetti April 17, 1958 July 18, 1961 Capellaro - Multiplication mechanism for adding machines -
3018044 Underwood Corp. December 29, 1955 January 23, 1962 Anderson - Tens transfer mechanism for an adding machine Tens-carry
3029014 Olivetti August 1, 1952 April 10, 1962 Capellaro - Differential mechanism for value entry, tens transfer and total taking -
3044697 Monroe Calculating Machine Co. November 7, 1958 July 17, 1962 Gang - Value selection and entering means for calculating machines -
3081938 Walther Buromaschinen Gesellschaft m.b.H. June 28, 1960 March 19, 1963 Walther - Device for controlling the position of the decimal point in adding and calculating machines Decimal point key and mechanism to not require entry of trailing zeros
3221644 Precisia A.G. April 5, 1962 December 7, 1965 Gelling - Printing device with zero suppressing means Leading zero suppression for printing numbers
3232223 Olympia Werke A.G. March 4, 1964 February 1, 1966 Thevis - Printing mechanism for business machines Improved mechanism to reduce misalignment of printed numbers
3315889 Olympia Werke A.G. September 21, 1964 April 25, 1967 Thevis - Control key arrangement for a calculator Switch/lever changes behavior of storage/totaling keys
3458124 Citizen Watch Co. Ltd. August 1, 1966 July 29, 1969 Piero - Printing device with zero-position selecting mechanism Calculator printer mechanism
3482775 Citizen Watch Co. Ltd. November 10, 1966 December 9, 1969 Piero - Simultaneous transfer mechanism for calculating machines -
3526356 Olympia Werke A.G. August 23, 1967 September 1, 1970 Hesse - Zero key locking arrangement for a ten key calculator Prevents entry of leading zeros
AI229 (none) (none given) April 19, 1859 Castle - Improved arithmometer for addition Additional improvement for patent 21941
RE00551 (none) (none given) May 11, 1858 Castle - Prepared arithmometer for adding Reissue of 18675

Notes:

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


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Last updated November 5, 2006