| Patents for Henry Bolthoff |
Patents 1 -
15
of 17
      |
| Number | Date | Patentee | Title | Type |
| 121,985 | Dec. 19, 1871 | H. Bolthoff | Improvement in stamp-guides | ore processing apparatus |
| 166,743 | Aug. 17, 1875 | H. Bolthoff | Improvement in wet and dry ore crushers | ore processing apparatus |
| 204,945 | Jun. 18, 1878 | H. Bolthoff | Improvement in pulverizing apparatus | ore processing apparatus |
| 260,527 | Jul. 04, 1882 | H. Bolthoff | Cam-shaft box for stamp-mills | ore processing apparatus |
| 261,297 | Jul. 18, 1882 | H. Bolthoff | Mortar for stamp-mills | ore processing apparatus |
| 312,956 | Feb. 24, 1885 | H. Bolthoff | Stamp-mill | |
| 451,720 | May 05, 1891 | H. Bolthoff | Steam-engine | steam engine valves |
| 494,518 | Mar. 28, 1893 | H. Bolthoff | Brake mechanism | industrial elevators and lifts |
| 515,896 | Mar. 06, 1894 | H. Bolthoff | Mortar for stamp-mills | ore processing apparatus |
| 526,007 | Sep. 11, 1894 | H. Bolthoff | Hoisting-drum | industrial elevators and lifts |
| 533,388 | Jan. 29, 1895 | H. Bolthoff | Register-valve | steam valves |
| 563,217 | Jun. 30, 1896 | H. Bolthoff | Ore-feeder for stamp-mills | ore processing apparatus |
| 568,832 | Oct. 06, 1896 | H. Bolthoff | Hoisting-machine | industrial elevators and lifts |
| 582,616 | May 18, 1897 | H. Bolthoff | Hoisting-machine | hoists, winches, come-alongs |
| 793,561 | Jun. 27, 1905 | H. Bolthoff | Engine | industrial elevators and lifts |
