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...that on Dec. 15, 1836, the Patent Office was completely destroyed by fire? Lost were some 7,000 models, 9,000 drawings, and 230 books plus all records of patent applications and grants.
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| Number | Title | Issue Date |
| 4826018 | Mineral fines separation machine A mineral slurry processing machine for recovering gold from raw fines. An elongated, rigid skid supports a frame plate coupled thereto by vibration transmitting bearings. An inclined processing ramp is adjustably mounted to the plate. An endless belt ent... | 05/02/1989 |
| 4671877 | Dewatering apparatus Dewatering apparatus having a screen with alternate perforate sections and inperforate accelerator sections, both on a slope. The input feed may be pulsed the better to resist any tendency for the screen to blind.... | 06/09/1987 |
