CA Patent: CA-36,245
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| Screw bolt and nut
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Patentee:
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| Clinton Allen Higbee (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Apr. 01, 1891 |
CIPO Data
Espacenet patent
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Jeff Joslin
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Description: |
| This is the Canadian equivalent of US patent 447,775: the "Higbee thread", which makes a screw easier to start by trimming off the incomplete start of the thread and cutting the remaining end of the thread tangent to the minor diameter. |
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