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| Patents for Felix Fossard | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,329X | Dec. 14, 1832 | F. Fossard | Dying with alkaline prussiates | ||
| 8,162X | Apr. 23, 1834 | F. Fossard | Dying with alkaline prussiates, manufacturing potash | manufacturing potash | |
| 9,227X | Nov. 07, 1835 | F. Fossard | Dying, and manufacturing of prussiate of potash and soda | manufacturing potash | |