- The folowing information was taken from the "Directory of American Tool and Machinery Patents" (DATAMP) website. Patents where the tool was "not known to have been produced" are not included.
- Updated November, 2025
- Approx.10% of patents for dividers and calipers were actually manufactured
- Patents for
calipers often apply to dividers and vice-versa
- The following list is no doubt incomplete and likely contains errors
- I currently have examples of 66% of the 72 patents below in my collection (the search goes on)
- u.m. = unknown manufacturer (according to DATAMP)
- Every year patents listed by DATAMP as "not known to have been produced" turn up in sales
Date Patentee Manufacturer
Nov. 21, 1848 Thorn & Rieffel Fessenden, Wilkenson & Co.
Oct. 1, 1850 W. W. Smith W. W. Smith
Jan. 3, 1860 C. D. Sutton u.m.
Jan. 27, 1863 D. C.Talbot Kimball & Talbot
Jul, 21, 1863 C. A. Fairfield u.m.
Jan. 26, 1864 W. A. Morse u.m.
Aug. 16, 1864 C. Jilson J & E
Dec. 12, 1865 B. G. Martin u.m.
Jan. 9, 1866 Phleghar & Schollhorn u.m.
May 28, 1867 G. L. McKnight G. L. McKnight
Sept. 24, 1867 E. Wright Wright Machine Co.
Jul. 7, 1868 S. Sawyer u.m.
Feb. 8, 1870 Hadley & Page Stevens & Co.
Feb. 14, 1871 T. Alteneder T. Alteneder
Dec. 12, 1871 A. A. Cook Copeland & Chamberlain
Aug. 27, 1872 O. Stoddard u.m. (Stevens?)
Feb. 18, 1873 O.E. Weatherhead u.m.
Jun 17, 1873 W. Schollhorn u.m. (Schollhorn?)
Nov. 11, 1873 G. C. Miller Detroit Bevel & Divider
March 31, 1874 G. C. Miller Detroit Bevel & Divider
Feb 22, 1876 T. McDonough Star Tool
Aug. 22, 1876 A. Gruber L. Prang
Feb. 5, 1878 A. P. Freshman A. P. Freshman
June 25, 1878 H. C. Wight Copeland & Chamberlin
Mar. 9, 1880 J. F. Sullivan u.m.
Mar. 22, 1881 F. J. Thomas C. F. Richardson
July 16, 1881 Hagerty Osborne
Dec. 20, 1881 C. P. Fay W. Fay & Co.
Apr. 4, 1882 E.C. Smith u.m.
July 24, 1884 W.P. Dodson u.m.
Jan. 6, 1885 F.G. Lilja Starrett
Mar. 31, 1885 O. Stoddard u.m.
June 2, 1885 C. P. Fay L. S. Starrett
Feb.23, 1886 G. M. Pratt J.
Stevens Arms & Tool
Mar. 9, 1886 J.Stevens J. Stevens Arms & Tool
Aug. 10, 1886 T. C. Hendey J. Stevens Arms & Tool
Oct. 26, 1886 Warfield
& Stevens J. Stevens Arms & Tool
Jan. 4, 1887 J. D. Wright Wright Machine +
Starrett
May 24, 1887 S. Copeland u.m.
Jun 7, 1887 J. D. Wilkinson u.m.
Oct. 11, 1887 J. H. Culver Peck, Stow & Wilcox
Dec. 27, 1887 C. P. Fay L. S. Starrett
Dec. 27, 1887 L. S. Starrett L. S. Starrett
Feb. 14, 1888 J. Stevens J. Stevens Arms & Tool
May 7, 1889 F. A. Welles F. A. Welles
Sept. 24, 1889 L. S. Starrett L. S. Starrett
Jul. 22, 1890 J. Stevens J. Stevens Arms & Tool
Jul. 19, 1892 W. A. Bernard W. Schollhorn
Dec. 11, 1894 H. Cole Eagle Pencil
May 21, 1895 Starrett & Fay L. S. Starrett
Sept. 15, 1896 C. Klaui u.m.
Oct. 5, 1897 C. P. Fay J. Stevens Arms & Tool
Mar. 28, 1899 W.C. Day National Drafting Tool
Jan. 30, 1900 L. S. Starrett L.S. Starrett
Aug. 7, 1900 W. A. Bernard W. Schollhorn
Apr. 16, 1901 L. S. Starrett L. S. Starrett
Apr. 28, 1903 F. A. Hatch W. E. Trufant
Jun. 2, 1903 C. Fosby u.m.
Jun. 30, 1903 O. Stoddard u.m. (J. Stevens?)
July 4, 1905 Simpson
& Starrett L. S. Starrett
Oct. 17, 1905 W. A. Bernard W. Schollhorn
Dec. 5, 1905 W. A. Bernard W. Schollhorn
Jun. 12, 1906 Nadeau & Brias F. Brais
Oct. 2, 1906 Petzold & Kohler Rochester Experimental
Jun. 30, 1914 E. E. Ellis Union Caliper
Apr. 13, 1915 Blake
& Reidy u.m.
Mar. 20, 1917 A. W. Bjornstad u.m.
Feb. 25, 1919 L. Kaplan Indicating Calipers
Jan. 18, 1921 T. E. Grove Grove Mfg.
May 23, 1922 Green
& Schuh C. F. Pease
Sep. 19, 1922 H. Perrot H. Perrot (Germany)
Oct. 15, 1929 E. J. Tjurnlund Reiner & Campbell
Mar. 2, 1943 F. G. Eubanks u.m.
Sep. 25, 1985 C. A. Emerson Creative Publications
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