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| Patents for William L. Trill | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,028,154 | Jun. 04, 1912 | W.L. Trill | Continuous Indicator for Engines | steam engine indicators | |
| 1,028,155 | Jun. 04, 1912 | W.L. Trill | Continuous Indicator for Engines | steam engine indicators | |
| 1,056,950 | Mar. 25, 1913 | J.W. Sheperdson | Engine Indicator | steam engine indicators | |