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| Patents for N. W. Hopkins | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,227,511 | May 22, 1917 | T.B. Williams, F.L. Smith | Facing-tool for dressing valve-seats, &c. | automotive tools | |
| 1,227,512 | May 22, 1917 | T.B. Williams, F.L. Smith | Facing-tool for dressing valve-seats, &c. | automotive tools | |
| 1,227,513 | May 22, 1917 | T.B. Williams, F.L. Smith | Facing-tool for dressing valve-seats, &c. | automotive tools | |
| 1,227,514 | May 22, 1917 | T.B. Williams, F.L. Smith | Rotary cutter | automotive tools | |