US Patent: 1,908,081
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| Screw driver
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Patentee:
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| John P. Thompson (exact or similar names) - Portland, OR |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 17, 1932 |
| Granted: |
May 09, 1933 |
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Steve Gosselin
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Description: |
| This is the immediate predecessor to the Phillips screwdriver. Thompson was reportedly unable to find anyone who could manufacture his screw and then sold his rights to Henry F. Phillips. See also Thompson's patent for the screw matching this screwdriver: patent 1,908,080. |
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