| All Patents in class 451/380 |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 40,838 | Dec. 08, 1863 | J.A. Hendrick | Improvement in Machines for Grinding and Polishing Tools | tool grinders |
| 359,943 | Mar. 22, 1887 | G.H. Smith | Attachment for Grinding Machines | grinding attachments |
| 411,845 | Oct. 01, 1889 | O.S. Walker | Drill-grinding machine | sharpening machines |
| 543,458 | Jul. 30, 1895 | J. Berry | Machine for Sharpening Insertable Saw Teeth | saw sharpening machines |
| 904,817 | Nov. 24, 1908 | F. Stutzman | Universal grinding-machine | bench or pedestal grinders |
| 946,635 | Jan. 18, 1910 | F. Franke | Machine for grinding straight machine-knives | cutter grinding |
| 1,016,585 | Feb. 06, 1912 | P.A. Solem | Grinding-machines | sharpening machines |
| 1,214,241 | Jan. 30, 1917 | V.M. Tuthill | Universal knife-holding bar | sharpening mechanisms |
| 2,467,674 | Apr. 19, 1949 | E.C. Krueger | Tool grinder | |
| 3,151,420 | Oct. 06, 1964 | G.J. Machacek, Jr. | Machine for grinding knives | sharpening machines |
| 4,733,501 | Mar. 29, 1988 | F.A. McLean | Honing guide | |
| 6,926,596 | Aug. 09, 2005 | W.A. Tarris | Tool Sharpening Apparatus | tool grinders |
