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| Patents for Horatio Gates Spafford | |||||
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| Number | Date | Patentee | Title | Type | |
| 599X | May 03, 1805 | H.G. Spafford | Close Fire Place | fireplaces | |
| 3,603X | Oct. 30, 1822 | H.G. Spafford | Art of making cast and wrought steel | steel maker | |
| 3,604X | Oct. 30, 1822 | H.G. Spafford | Making iron and steel | steel maker | |
| 3,625X | Dec. 19, 1822 | H.G. Spafford | Art of making edge tools | tool maker | |