| All Patents in class 51/309 |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| 94,955 | Sep. 21, 1869 | R.J. Costain, N.B. Hadley | Improved compound for emery-wheels and oil-stones | |
| 95,824 | Oct. 12, 1869 | E.C. Merrill, A.W. Willard | Improved composition for emery-wheels and other abrading-implements | grinding wheels |
| 108,408 | Oct. 18, 1870 | B.C. Tilghman | Improvement in cutting and engraving stone, metal, glass, &c. | |
| 113,439 | Apr. 04, 1871 | E.C. Merrill | Improvement in the manufacture of emery-wheels and artificial stone | grinding wheels |
| 226,066 | Mar. 30, 1880 | G. Hart | Emery-wheel | grinding wheels |
| 261,198 | Jul. 18, 1882 | R. Barton | Dental Grinding Tool | dental apparatus |
| 341,867 | May 18, 1886 | L.W. Andrews | Grinding-machine | grinding wheels |
| 2,523,698 | Sep. 26, 1950 | F.E. Hawley | Method of Making Diamond Loaded Abrasive Articles | wheel truing devices |
| 2,545,676 | Mar. 20, 1951 | L. Small | Diamond impregnated dressing tool | grinder dressers |
| 2,996,793 | Aug. 22, 1961 | T.D. Jayne | Tool Material | lathe tools |
| 3,972,161 | Aug. 03, 1976 | M.H. Zoiss | Solid abrading tool with fiber abrasive | |
| 5,536,282 | Jul. 16, 1996 | R.A. Gary, S.C. Yoon | Method for Producing an Improved Vitreous Bonded Abrasive Article and the Article Produced Thereby | grinder wheels |
| 7,429,151 | Sep. 30, 2008 | I. Hessman | Coated Inserts for Wet Milling | carbide inserts and holders |
| 7,431,542 | Oct. 07, 2008 | I. Hessman | Coated Cutting Insert | carbide inserts and holders |
