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| Patents Granted on 1891-03-31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 449,129 | Mar. 31, 1891 | V.J. McDonnell | Monkey Wrench | quick adjust wrenches | |
| 449,135 | Mar. 31, 1891 | C.T. Pratt | Drill Chuck | drill press chucks | |
| 449,148 | Mar. 31, 1891 | G.H. Weston | Rotary Engine | rotary steam engines | |
| 449,217 | Mar. 31, 1891 | A.T. Good | Polishing Cone | dental apparatus | |
| 449,246 | Mar. 31, 1891 | S.P. Graham | Boring-tool holder | drill press chucks | |
| 449,250 | Mar. 31, 1891 | T.F. Vandegrift | Pliers | pliers | |
| 449,257 | Mar. 31, 1891 | G.L. McCauley | Wrench | ratchet wrenches | |
| 449,310 | Mar. 31, 1891 | E.E. Coble | Watch Maker's Pliers | pliers | |
| 449,325 | Mar. 31, 1891 | W.J. Kendig | Rotary Engine | rotary steam engines | |
| 449,392 | Mar. 31, 1891 | J. Walker | Lathe and Planer Attachment | metal lathe accessories and attachments | |
| 449,410 | Mar. 31, 1891 | H. Hammond | Improvements in Pipe and Other Wrenches | pipe wrenches | |
| 449,431 | Mar. 31, 1891 | J.B. Rhodes | Saw-swaging machine | saw swages | |
| 449,461 | Mar. 31, 1891 | M.C. Bollenbacher | Spoke-lathe feeder | wheelwright | |
| 449,476 | Mar. 31, 1891 | W.H. Haire | Ratchet Wrench | ratchet wrenches | |
| 449,504 | Mar. 31, 1891 | J.E. Waterous | Valve for steam-engines | steam engine valve gear | |