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| Patents for Nicolaus A. Otto | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 194,047 | Aug. 14, 1877 | N.A. Otto | Gas-Motor engines | |
| 196,473 | Oct. 23, 1877 | W.J. Crossley, F.W. Crossley, N.A. Otto | Gas Motor Engine | ||
| 241,707 | May 17, 1881 | N.A. Otto | Gas Motor Engine | ||
| 288,479 | Nov. 13, 1883 | N.A. Otto | Gas Engine | ||