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| Patents for Albert C. Bell | |||||
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| Number | Date | Patentee | Title | Type | |
| 639,671 | Dec. 19, 1899 | H. De Smith | Gage | measurement gauges | |
| 986,630 | Mar. 14, 1911 | F. Hardinge | Watchman's clock | ||
| 1,016,688 | Feb. 06, 1912 | F. Hardinge | Watchman's clock | ||
| 1,042,385 | Oct. 29, 1912 | A.C. Bell | Signalling system | ||
| 1,046,182 | Dec. 03, 1912 | F. Hardinge | Signaling system | ||
| 1,188,349 | Jun. 20, 1916 | F. Hardinge | Key for watchmen's clocks | ||