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| Patents for Gates Iron Works | |||||
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| Number | Date | Patentee | Title | Type | |
| 201,646 | Mar. 26, 1878 | C.M. Brown | Improvement in ore crushers and grinders | ore processing apparatus | |
| 525,443 | Sep. 04, 1894 | P.W. Gates, E.E. Hanna, C.L. Carman | Gyrating crusher | ore processing apparatus | |
| 606,543 | Jun. 28, 1898 | E.E. Hanna | Self-lubricating engine | internal combustion engines | |