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| Patents Granted on 1799-03-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 239X | Mar. 02, 1799 | C. Whiting | Extracting oil from cotton seeds | cotton presses | |
| 240X | Mar. 16, 1799 | J. Shotwell | Sharpening axes | sharpeners | |
| 241X | Mar. 19, 1799 | J. Perkins | Check to detect counterfeits | office worker | |
| 242X | Mar. 21, 1799 | J. Shackford | Improvement in propelling boats | nautical propulsion apparatus | |
| 243X | Mar. 27, 1799 | I. Sanford | Machine for dressing cloth | textile machines | |
| 244X | Mar. 27, 1799 | S. Morey | Obtaining force from water by steam | steam engines | |