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| Patents Granted on 1843-03-__ | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,991 | Mar. 04, 1843 | J. Williams, Jr. | Screw-Wrench | screw adjust wrenches | |
| 2,997 | Mar. 10, 1843 | J.E. Kenderdine | Sawmill | reciprocating sawmills | |
| 3,008 | Mar. 21, 1843 | T. Blanchard | Work-rest for machine for turning irregular forms | pattern lathes | |
| 3,014 | Mar. 21, 1843 | E. Martin | Improvement in Awl Hafts | ||
| XC-183 | Mar. 31, 1843 | W. Creighton | Improvement in the rotary steam engine | rotary steam engines | |