CA Patent: CA-116,463
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| Screw
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Patentee:
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| Peter Lymburner Robertson (exact or similar names) - Hamilton, ON Canada |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 24, 1907 |
| Granted: |
Feb. 02, 1909 |
CIPO Data
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Jeff Joslin
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Description: |
| This is the patent for the Robertson screw, which is still the dominant screw type in Canada. The patent actually covers the manufacturing process for the square recess. US patent 975,285 is equivalent to this Canadian patent. |
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