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| Patents for Henry F. French | |||||
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| Number | Date | Patentee | Title | Type | |
| 110,023 | Dec. 13, 1870 | J.S. Elliott | Improvement in machines for mixing the materials to form artificial stone, &c. | ||
| 110,102 | Dec. 13, 1870 | J.F. Wood | Improvement in the manufacture of emery-wheels | ||
| 111,921 | Feb. 21, 1871 | J.S. Elliott | Improvement in machines for forming artificial stone | ||