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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2,552,580
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May. 15, 1951
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Vise having jaws supportable on flat surface of machine tool by spindle adjustable and lockable in plane parallel to said surface
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Henry Persson |
Miami, FL |
This is the well-known Float-Lock vise, which (as of 2017) is still in production as the Wahlstrom Float Lock Drill Press Vise from Penn Tool Co., Inc. |
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2,724,295
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Nov. 22, 1955
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Quick change vise having having jaw supportable on flat surface of a machine tool and a spindle adjustable and lockable in plane parallel to said surface
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Henry Persson |
Bloomfield, NJ |
This patent contains improvements to the Float-Lock vise of patent 2,552,580, which was reissued as 23,519. |
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3,520,527
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Jul. 14, 1970
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Quick-change vise
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Henry Persson |
Bloomfield, NJ |
Improvements to the original quick-release Float-Lock vise of patent 2,724,295. The main improvement is a simplified shaft clamp, and there is a safety stop to prevent the half-nut from disengaging when the clamp is tightened. |