| Patents for Union Stone Co. |
Patents 16 -
23
of 23
      |
| Number | Date | Patentee | Title | Type |
| 131,010 | Sep. 03, 1872 | E.A. Locke | Improvement in composition grave-stones, monuments, &c. | |
| RE5,401 | May 13, 1873 | J.S. Elliott | Improvement in machines for forming building-blocks | |
| 151,788 | Jun. 09, 1874 | J.H. Martin | Improvement in Saw Gummers | saw gummers |
| 158,172 | Dec. 29, 1874 | C.H. Hill, A.W. Proctor | Improvement in machine for grinding knives | cutter grinding |
| 158,173 | Dec. 29, 1874 | C.H. Hill, A.W. Proctor | Improvement in belt-shifters | cutter grinding |
| 218,847 | Aug. 26, 1879 | J.F. Wood | Improvement in journal-boxes for shafts of stone-crushers | industrial machine bearings |
| 227,402 | May 11, 1880 | J.F. Wood | Treatment of emery-wheels | grinding wheels |
| 290,619 | Dec. 18, 1883 | J.F. Wood | Combined knife-brick box and grinder | |
