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| Patents for Philo Pratt | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,092X | Apr. 20, 1825 | P. Pratt | Sawing ivory comb teeth | comb making machines | |
| 4,193X | Sep. 09, 1825 | P. Pratt | Machine for cutting teeth in ivory combs | comb making machines | |
| 4,271X | Nov. 22, 1825 | P. Pratt | Vise used in cutting combs | ||
| 4,997X | Feb. 12, 1828 | P. Pratt | Grailing machine | ||
| 4,998X | Feb. 12, 1828 | P. Pratt | Machine for slitting ivory plates for combs | ||