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| Patents for Richard Robotham | |||||
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| Picture | Number | Date | Patentee | Title | |
| 76X | Apr. 12, 1794 | R. Robotham | Manufacturing of Mortar for Flooring Houses, etc. | ||
| 80X | Jun. 02, 1794 | R. Robotham | Manufacturing of Candles | ||
| 255X | Aug. 14, 1799 | R. Robotham | Purifying spermaceti oil | ||
| 344X | Oct. 10, 1801 | R. Robotham | Air Pump Ventilator for Ships, Mines, Etc. | ||
| 345X | Oct. 10, 1801 | R. Robotham | Machine for Ruling Paper, etc. | ||