US Patent: 397,618
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| Pipe Wrench
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Patentee:
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| John H. Vinton (exact or similar names) - Boston, MA |
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Patent Dates:
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| Applied: |
Aug. 06, 1888 |
| Granted: |
Feb. 12, 1889 |
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Patent Pictures:
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1 | 2
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John H. Vinton patent Febr. 12, 1889 |
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Stan Schulz
1889 TRIMO pipe wrench (FLICKR)
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Description: |
| Patent covers the thread form on the adjusting knurl and movable jaw, the adjusting knurl for a pipe wrench and the frame holding the knurl. The earliest ads for the TRIMO pipe wrench show a construction like this patent. Extant early TRIMO pipe wrenches show features from this patent together with some from with utility patent no. 414,663 and design patent no. D19,168. |
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