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| Patents for Gertrude K. Smith | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,175,496 | Mar. 14, 1916 | O. Zerk | Lubricating-bolt | oil or grease fittings | |
| 1,218,749 | Mar. 13, 1917 | W.L. Deming | Projectographoscope | ||
| 1,265,861 | May 14, 1918 | O. Zerk | Grease Cup | ||