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| Patents for Thomas Gregg | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,079X | Mar. 16, 1814 | T. Gregg | Air furnace for melting ores, refining and heating iron with stone coal | ||
 | 2,081X | Mar. 19, 1814 | T. Gregg | Ball Proof Vessel Propelled by Steam Applied Under Water | |
| 7,078X | May 22, 1832 | T. Gregg | Blast furnace for smelting iron ore | ||