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| Patents for William H. Chapman | |||||
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| Number | Date | Patentee | Title | Type | |
| 35,062 | Apr. 22, 1862 | S. Perry | Tread horse-power | animal powered apparatus | |
| 35,063 | Apr. 22, 1862 | S. Perry | Improvement in circuit horse-powers | animal powered apparatus | |
| 592,175 | Oct. 19, 1897 | H.H. Sheely | Churn Dasher | churns | |
| 599,892 | Mar. 01, 1898 | W.H. Chapman | Electric regulator for dynamos | ||
| 613,853 | Nov. 08, 1898 | W.H. Chapman | Electric regulators | ||