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American Slide Rule Patents

Table of Contents

The patent list is grouped by decades. The list was compiled by Osborne Price.


Patent-Related Links

Patents 1851 - 1900

Patent

Issue Date

Title

Inventor

7,961 Mar 4, 1851 Calculating Machine John W. Nystrom
199,289 Jan 15, 1878 Calculator (circular slide rule) Walter Hart
219,246 Sep 2, 1879 Calculator (cylindrical slide rule) George Fuller
219,246 Sept 2, 1879 Calculator (cylindrical slide rule) George Fuller
249,117 Nov 1, 1881 Slide Rule Edwin Thacher
387,070 Jul 31, 1888 Logarithmic Sliding Scale Walter Hart
426,444 Apr 29, 1890 Sliding Calculating Scale Walter Hart
460,930 Oct 6, 1891 Engineer's Slide Rule William Cox
492,677 Feb 28, 1893 Crytographic Instrument Richard Harte
513,172 Jan 23, 1894 Logarithmic Calculator (cylindical) Julius Billeter
520,114 May 22, 1894 Slide Rule T.H. Johnson
543,612 July 30, 1895 Slide Rule Branch H. Colby
603,370 May 3, 1898 Slide Rule J.E.G. Yalden
603,695 May 10, 1898 Slide Rule W.L.E. Keuffel
606,388 June 28, 1898 Slide Rule John G.D. Mack
621,348 Mar 21, 1899 Slide Rule W.L.E. Keuffel
651,142 Jun 5, 1900 Slide Rule W.L.E. Keuffel
657,916 Sept 18, 1900 Calculating Instrument Roger W. Conant

Patents 1901 - 1910

Patent

Issue Date

Title

Inventor

677,817 July 2, 1901 Slide Rule Edwin Thacher
694,258 Feb. 25, 1902 Slide Rule J.H.C. Dennert
701,103 May 27, 1902 Slide Rule Edwin Thacher
753,840 March 8, 1904 Slide Rule Barth, Gant and Taylor
767,170 Aug 9, 1904 Engineer's Slide Rule Leon Rosenthal
768,971 Aug 30, 1904 Slide Rule F.J. Anderson
773,235 Oct 25, 1904 Logartihmic Calculator Elmer A. Sperry
788,638 May 2, 1905 Wine and Spirit Calculating Rule F.C. Farmar
838,696 Dec 18, 1906 Slide Rule W.F. Doherty
843,944 Feb 12, 1907 Calculating Device Robert L. Hibbard
845,463 Feb 26, 1907 Slide Rule (circular) Harold T. Hincks
879,237 Feb 18, 1908 Slide Rule Baumbach and Klitsche
880,907 March 3, 1908 Slide Rule Franz Nickel
887,390 May 12, 1908 Slide Rule J.L. Hall
907,373 Dec 22, 1908 Slide Rule W.L.E. Keuffel
909,621 Jan 12, 1909 Calculating Device Sidney R. Lamb
922,465 May 25, 1909 Calculating Device Robert H. Fenn
937,863 Oct. 26, 1909 Flexible Slide Rule Robert J. Roberts
962,441 June 28, 1910 Calculator Harry L. Lerner
974,354 Nov. 1, 1910 Radiation Calculator Paul F. Brown

Patents 1911 - 1920

Patent

Issue Date

Title

Inventor

980,412 Jan. 3, 1911 Slide Rule G.H. Gibson
982,876 Jan. 31, 1911 Slide Rule George Richardson
996,039 June 20, 1911 Magnifier for Slide Rule W.L.E. Keuffel
1,000,562 Aug. 15, 1911 Slide Rule B.T. Steber
1,012,660 Dec. 26, 1911 Calculating Device (watch type) George Lange (of Hoboken)
assigned to Keuffel & Esser
1,017,719 Feb. 20, 1912 Circular Slide Rule Herbert R. Watts
1,021,484 Mar. 26, 1912 Slide Rule George Richardson
1,028,237 June 4, 1912 Slide Rule A.N. Lurie
1,041,204 Oct. 15, 1912 Elapse Time Computer and 
Century Calendar Machine
Allen Van Resselaer and
Fred Tenney
1,042,755 Oct. 29, 1912 Calculator (circular) Franklin S. Beckett
1,050,129 Jan. 14, 1913 Slide Rule R.M Hamby
1,056,775 Mar. 25, 1913 Circular Slide Rule David W. Brunton
1,062,321 May 20, 1913 Slide Rule J. W. Buzzell
1,075,124 Oct. 7, 1913 Slide Disk Calculator John A. Scheibli
1,088,175 Feb. 24, 1914 Slide Rule W.O. Phillips
1,108,480 Aug. 25, 1914 Slide Rule H.W. Tomlinson
1,110,855 Sept. 15, 1914 Slide Rule C.D. Alan
1,123,507 Jan. 5, 1915 Slide Rule F.C. Farmar
1,145,042 July 6, 1915 Calculating Device (fluid flow in pipes) Jacob M. Spitzglass
1,150,771 Aug. 17, 1915 Slide Rule Runner  W.L.E. Keuffel
1,154,619 Sept. 28, 1915 Slide Rule C.F.Dieckman 
1,157,526 Oct. 19, 1915 Slide Rule C.A. Gilson
1,170,886 Feb. 8, 1916 Wage Computer Jean C. Flamand
1,181,672 May 2, 1916 Slide Rule Runner W.L.E. Keuffel
1,210,488 Jan 2, 1917 Slide Rule Kelly and Hornyak
 1,250,379 Dec 18, 1917  Slide Rule  Stillman and Schleicher 
1,260,454 March 26, 1918 Slide Rule George W. Richardson
1,279,798 Sept. 24, 1918 Slide Rule W.A. Warman
1,291,742 Jan 12, 1919 Slide Rule W.J. Bousquet
1,329,902 Feb 3, 1920 Slide Rule J. Hemmi
1,338,588 April 27, 1920 Calculating Device (circular) Ford L. Prescott
1,343,549 June 15, 1920 Slide Rule C.J. Davidson

Patents 1921 - 1930

Patent

Issue Date

Title

Inventor

1,364,154 Jan 4, 1920 Slide Rule Stillman and Schleichter
1,378,993 May 24, 1921 Slide Rule E. Bohnke
1,382,011 June 21, 1921 Slide Rule O'Neil and Payne
1,387,267 Aug 9, 1921 Slide Rule Magnifier C. Holle
1,398,914 Nov. 29, 1921 Slide Rule R.A. Pierce
1,404,019 Jan 17, 1922  Mechanical Calculating Device Clair A. Gilson
1,404,951 Jan 31, 1922 Slide Rule E.T. Frankel
1,405,333 Jan. 31, 1922 Slide Rule Herman Ritow
1,411,541 April 4, 1922 Slide Rule M. Tang
1,431,409 Oct 10, 1922 Slide Rule W.L. Miller
1,437,298 Nov. 28, 1922 Belt Calculator Gustav R. Fickert
1,455,339 May 15, 1923 Slide Rule Keller and Badge
1,459,857 June 26, 1923 Slide Rule Olin D. Parsons
1,461,677 July 10, 1923 Slide Rule C.N. Reynolds
1,461,975 July 17, 1923 Slide Rule Eaton and Lamay
1,484,176 Feb 19, 1924 Computing Device Willaim S. Haines
1,487,805 Mar 25, 1924 Device for Making Vector Calculations A.F. Puchstein
1,488,686 Apr 1, 1924 Log Log Duplex Slide Rule Adolf W. Keuffel
1,525,752 Feb 10, 1925 Slide Rule C.S. Larkey
1,532,014 Mar 31, 1925 Slide Rule F. Womper
1,553,969 Sept 15, 1925 Slide Rule J.S. Wollk
1,554,176 Sept. 15, 1925 Slide Rule K. Becker
1,560,599 Nov. 10, 1925 Slide Rule C.C. Moler
1,568,475 Jan 15, 1926 Vector Calculator M.P. Weinbach
1,581,567 Apr 20, 1926 Slide Rule J.E. Eshbaugh
1,596,129 Aug 17, 1926 Slide Rule R. Uhlich
1,597,483 Aug 24,1926 Slide Rule Herman Ritow
1,602,479 Oct 12, 1926 Slide Rule Balmer, Hardenbergh and Fisk
1,605,355 Nov 2, 1926 Slide Rule S. Lee
1,605,922 Nov 9, 1926 Slide Rule G.M. Cook
1,609,972 Dec 7, 1926 Slide Rule Scherrer and Hess
1,632,505 June 14, 1927 Slide Rule Herman Ritow
1,655,819 Jan 10, 1928 Calculating Device C.R. Nichols
1,659,246 Feb 14, 1928 Calculating Device R.S. Drew and C.L. Cruver
1,661,095 Feb 28, 1928 Calculating Device J.E. Rowe
1,667,449 Apr 24, 1928 Magnifying Device for Slide Rules F. Womper
1,674,157 June 19, 1928 Calculating Device C.F. Christopher
1,678,019 July 24, 1928 Calculating Device N.L. Oates
1,691,104 Nov 13, 1928 Calculating Device J.G. Zollman

Patents 1931 - 1940

Patent

Issue Date

Title

Inventor

1,790,569 Jan 27, 1931 Slide Rule J. Asper
1,834,745 Dec. 1, 1931 Slide Rule N. Shifner
1,849,058 Mar 15, 1932 Circular Slide Rule J.A. Dempster
1,855,523 Apr 26, 1932 Slide Rule Indicator A. Langsner
1,870,655 Aug 9, 1932 Computation Rule M.O. Schur
1,875,927 Sept 6, 1932 Slide Rule Adolf W. Keuffel
1,892,012 Dec 27, 1932 Flexible Slide Rule Hans Seehase
1,894,294 Jan 17, 1933 Slide Rule A. Langsner
1,904,474 Apr 18, 1933 Slide Rule A.W. Keuffel
1,930,852 Oct 17, 1933 Slide Rule A.W. Keuffel
1,934,232 Nov 7, 1933 SlideRule A.W. Keuffel
1,942,349 Jan 2, 1934 Slide Rule F. Wompner
1,947,699 Feb 20, 1934 Slide Rule B.G. Dwyre
1,952,134 Mar 27, 1934 Slide Rule A. Langsner
1,961,295 June 5, 1934 Calculating Device Melville P. Hite
1,978,038 Oct. 23, 1934 Slide Rule J.A. Boll
1,983,062 Dec 4, 1934 Medical Arts Sterility Slide Rule Cyrus W. Anderson
1,987,536 Jan 8, 1935 Slide Rule C. Norris
2,000,337 May 7, 1935 Slide Rule Case A.W. Keuffel
2,061,853 Nov. 24, 1936 Slide Rule G.D. Schaeffer
2,071,195 Feb 16, 1937 Slide Rule E.L. Bowles
2,079,464 May 4, 1937 Hyperbolic Slide Rule Hisashi Okura
2,086,502 July 6, 1937 Runner for Slide Rule A.W. Keuffel
2,087,446 July 20, 1937 Slide Rule F.E. Proal
2,091,039 Aug 24, 1937 Slide Rule R.D. Groch
2,117,155 May 10, 1938 Calculating Device Cornelius Jan Dussel
2,117,413 May 17, 1938 Decimal Point Indicating Mechanism
for Slide Rule Computation
Howard Gilmore
2,120,878 Jun 14, 1938 Slide Rule J.G. Valenzuela
2,136,169 Nov 8, 1938 Slide Rule Indicator A.W. Keuffel
2,137,630 Nov 22, 1938 Slide Rule N. Sinitzin-White
2,138,879 Dec 6, 1938  Slide Rule R.B. Poole
2,143,559 Jan 10, 1939 Slide Rule A.W. Keuffel
2,153,089 Apr 4, 1939 Add/Subtract Device for Slide Rules Carl Kubler
2,156,568 May 2, 1939 Computing Device John W. Lee
2,158,476 May 16, 1939 Slide Rule G.H. Morse
2,161,345 Jun 6, 1939 Rhythmic Cycle Calendar Velma A. Gates
2,168,056 Aug 1, 1939 Slide Rule Carl Bernegan
2,170,144 Aug 22, 1939 Slide Rule Lyman, Kells et.al.
2,173,459 Sept. 19, 1939 Slide Rule P.M. Van Doorman
2,190,281 Feb 13, 1940 Slide Rule C.P. Berg
2,221,476 Nov. 12, 1940 Sldie Rule H.C. Goodrich

Patents 1941 - 1950

Patent

Issue Date

Title

Inventor

2,235,106 Mar 18, 1941 Slide Rule E. Hirand
2,264,406 Dec 2, 1941 Reset Slide Rule E.A. Ravenscroft
2,265,372 Dec 9, 1941 Slide Rule Johnson and Goyan
2,275,219 Mar 3, 1942 Circular Slide Rule W. Daeman
2,283,473 May 19, 1942 Slide Rule John Tyler, et. al.
2,285,722 Jun 9, 1942 Slide Rule Lyman, Kells, et.al.
2,289,717 Jul 14, 1942 Slide Rule for the Sightless R. Montgomery
2,301,033 Nov 3, 1942 Calculating Device (Circular) Alexander C. Findlay
2,334,725 Nov 23, 1943 Calculating Instrument Albert M. Perkins
2,335,792 Nov 30, 1943 Slide Rule M.A. Roggenkamp
2,341,681 Feb 15, 1944 Slide Rule M.C. Anderson
2,358,309 Sep 19, 1944 Slide Rule O.E. Batori
2,358,478 Sep 19, 1944 Rotary Slide Rule B. Sassen
2,358,479 Sep 19, 1944 Roatry Slide Rule B. Sassen
2,369,819 Feb 20, 1945 Slide Rule Joseph Dietzgen
2,385,948 Oct. 2, 1945 Slide Rule T.J. Setera
2,403,382 Jul 2, 1946 Slide Rule S. Lerner
2,405,720 Aug 13, 1946 Slide Rule A.L. Snedaker
2,407,338 Sep 10, 1946 Slide Rule Indicator A.H. Kreiling
2,415,231 Feb 14, 1947 Slide Rule O.E. Batori
2,418,910 Apr 15, 1947 Slide Rule J.J. Smidl
2,422,421 Jun 17, 1947 Slide Rule H.M. Kaufman
2,422,649 Jun 17, 1947 Slide Rule James R. Bland
2,429,212 Oct 21, 1947 Slide Rule O.E. Batori
2,430,599 Nov 11, 1947 Slide Rule O.E. Batori
2,434,306 Jan 13, 1948 Statistical Slide Rule K.R. Wood
2,435,705 Feb 10, 1948 Disc Slide Rule G.F. Wittgenstein
2,437,722 Mar 16, 1948 Slide Rule O.E. Battori
2,439,025 Apr 6, 1948 Slide Rule G.W. Sammons
2,439,413 Apr 13, 1948 Cryptographic Slide Rule Robert M. Mitchell
2,445,464 Jul 20, 1948 Slide Rule J.F. Ailinger
2,449,954 Sep 21, 1948 Slide Rule I.S. Roberts
2,454,157 Nov 16, 1948 Slide Rule for Sewer Design I. Goldfien
2,456,676 Dec 21, 1948 Slide Rule Indicator W.C. Chowns
2,460,558 Feb 1, 1949 Slide Rule O.A. Wiberg
2,463,067 Mar 1, 1949 Slide Rule Indicator W.O. Teasdale
2,466,983 Apr 12, 1949 Slide Rule A.F. Eckel
2,473,876 Jun 21, 1949 Slide Rule H.H. Goldstaub
2,478,547 Aug 9, 1949 Slide Rule Runner E. Pignone
2,486,748 Nov 1, 1949 Slide Rule F.L. Koenig
2,489,790 Nov 29, 1949 Slide Rule H.S. Lieberman
2,494,291 Jan 10, 1950 Rhythmic Cycle Indicator James P. Fay
2,500,460 Mar 14, 1950 Slide Rule Herschel Hunt
2,506,176 May 2, 1950 Slide Rule P. Sbernadori
2,511,270 Jun 13, 1950 Slide Rule B.D. Kahan
2,512,458 Jun 20, 1950 Slide Rule Y. Fujisaki
2,520,208 Aug 29, 1950 Sterility and Fertility Slide Rule Abraham Green
2,527,776 Oct 31, 1950 Slide Rule J.L. Taafe
2,530,047 Nov 14, 1950 Slide Rule N.F. Dewar
2,534,695 Dec 19, 1950 Slide Rule James R. Bland

Patents 1951 - 1960

Patent

Issue Date

Title

Inventor

2,543,313 Feb 27, 1951 Clip (to attach case to belt) Joseph E. Dietzgen
2,564,616 Aug 14, 1951 Slide Rule J. Telasco
2,569,202 Sep 25, 1951 Slide Rule C. Solomon
2,569,454 Oct 2, 1951 Slide Rule D.L. Cole
2,572,811 Oct 23, 1951 Calculating Machine Pierre J.L. Julien
2,575,288 Nov 13, 1951 Slide Rule J.N. Nielsen
2,594,857 Apr 29, 1952 Slide Rule W.J. Boos
2,595,299 May 6, 1952 Disc Slide Rule E.S. Russell
2,597,523 May 20, 1952 Slide Rule M.J. Quillinan
2,602,574 Jul 8, 1952 Slide Rule Belt Carrier G. Mangold and F. Zener
2,628,025 Feb 10, 1953 Slide Rule M.J. Quillinan
2,634,912 Apr 14, 1953 Slide Rule Indicator C.P. Davey
2,643,057 Jun 23, 1953 Slide Rule M.J. Quillinan
2,643,058 Jun 23, 1953 Slide Rule M.J. Quillinan
2,643,823 Jun 30, 1953 Slide Rule M.J. Quillinan
2,649,247 Aug 18, 1953 Slide Rule George R. Stibit
2,650,762 Sep 1, 1953 Slide Rule P.J. Tolen
2,658,671 Nov 10, 1953 Disc Slide Rule with Decimal Indicator J.M.A. Allaid

Patents 1961 - 1964

Patent

Issue Date

Title

Inventor

3,120,342 Feb 4, 1964 Slide Rule (Electronics) Darrel L. Geiger

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