If you find a patent number or patent date by this manufacturer that is not on this
list, please contact the Site Historian.
Key to Links for Patent Information
USPTO = U.S. Patent Office .
Images of the actual patent can be viewed on the U.S. Patent Office web site but
a special TIFF viewer must be installed with your browser in order properly work.
More information on how to configure your computer to view these patents can be
found at TIFF image Viewers
for Patent Images.
DATAMP = Directory of American Tool And
Machinery Patents . A sister site to VintageMachinery.org with information
on patents related to machinery and tools. A much easier user interface than the
USPTO's for finding information on machinery patents.
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2,370,351
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Feb. 27, 1945
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Clamping fixture
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Ernest F. Hohwart |
Detroit, MI |
This patent covers the earlier version of the N. A. Woodworth Co.'s drilling jig, the later version of which would be known as the "Cone-Lok". |
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426,149
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Mar. 13, 1945
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Clamping fixture
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Ernest F. Hohwart |
Detroit, MI |
This patent is the Canadian equivalent of US patent 2,370,351. |
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2,441,414
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May. 11, 1948
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Drill press
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Paul A. Smith |
Detroit, MI |
The primary innovation is a method of limiting the advance of the drill bit in a self-feeding drilling machine so as to prevent the bit from being damaged when it breaks through the workpiece which normally causes a large shock or jolt. |
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Drill press
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Ernest F. Hohwart |
Detroit, MI |
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Drill press
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George Hohwart |
Detroit, MI |
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2,456,061
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Dec. 14, 1948
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Double end center lapping machines
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George Hohwart |
Detroit, MI |
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3,073,589
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Jan. 15, 1963
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Work clamping fixture
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George Hohwart |
Detroit, MI |
Improvements to patent 2,370,351. This patent number has been seen on "Cone-Lok" drilling jigs from the assignee. |
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683,079
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Apr. 07, 1964
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Work clamping fixture
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George Hohwart |
Detroit, MI |
This is the Canadian equivalent to US patent 3,073,589. |