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| All Patents in class 318/137 | |||||
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| Number | Date | Patentee | Title | Type | |
| 459,772 | Sep. 22, 1891 | N. Tesla | Electro-magnetic motor | electric motors | |
| 1,073,662 | Sep. 23, 1913 | J. Burke | Means for controlling synchronous machines | synchronous motors | |
| 1,102,116 | Jun. 30, 1914 | J.J. Wood | Dynamo-electric machine | electric motors | |
| 1,373,621 | Apr. 05, 1921 | J.F. Lincoln | Safety Charging Device for Batteries | battery charging devices | |
| 1,947,423 | Feb. 13, 1934 | J.M. Naul | Phonograph motor | ||