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| Patents for William B. Fell | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,211,201 | Aug. 13, 1940 | W.B. Fell | Machinist's precision level | spirit levels | |
| 2,316,777 | Apr. 20, 1943 | W.B. Fell | Machinist's precision level | spirit levels | |
| 3,030,710 | Apr. 24, 1962 | W.B. Fell | Micro-precision levels | spirit levels | |