US Patent: 2,103,944
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| Screw Part and Driver
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Patentee:
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| Arthur V. Gullborg (exact or similar names) - Chicago, IL |
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Patent Dates:
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| Applied: |
Apr. 29, 1935 |
| Granted: |
Dec. 28, 1937 |
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Patent Pictures:
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Arthur V. Gullborg patent Dec. 28, 1937 |
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Stan Schulz
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Description: |
| The patent is based on the concept of visually appealing surface and fine serrations on the circumference of a screw head, nut, etc. and corresponding driving socket.
The patent number appears on GULMITE drivers associated with MAYTAG washing machines. The patent was also the basis for a series of "security" or "Crown Head" fasteners with multiple "points" on the circumference and corresponding wrenches, sockets, etc. |
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