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| Patents for Frank W. Lindgren | |||||
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| Number | Date | Patentee | Title | Type | |
| 642,313 | Jan. 30, 1900 | L. Faust, F.W. Lindgren | Hinge-mortising machine | mortising machines | |
| 741,685 | Oct. 20, 1903 | F.W. Lindgren | Lock | locks | |
| 798,737 | Sep. 05, 1905 | L. Faust, F.W. Lindgren | Frictional gearing | drill presses | |