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| Patents Granted on 1799-04-__ | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-179,902,305 | Apr. 11, 1799 | M.I. Brunel | Writing and drawing machine | ||
| 245X | Apr. 12, 1799 | P. Pratt | Machine for making ivory combs | comb making machines | |
| 246X | Apr. 24, 1799 | S. Morey | Improvement on his water engine | steam engines | |
| 247X | Apr. 30, 1799 | B. Dearborn | Double centered mill for wind or water | wind power apparatus | |