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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356,642
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Jan. 25, 1887
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Machine-table
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Leonard D. Howard |
St. Johnsbury, VT |
Improvements to patent 314,843. |
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429,807
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Jun. 10, 1890
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Power-hammer spring
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Philippe Dènéry Dupont |
St. Johnsbury, VT |
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36,927
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Jul. 04, 1891
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Coil spring power hammer
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Philippe Dènéry Dupont |
St. Johnsbury, VT |
This is, roughly, the Canadian equivalent of US patent 429,807. |
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513,326
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Jan. 23, 1894
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Power-hammer
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Leonard D. Howard |
St. Johnsbury, VT |
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58,429
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Dec. 17, 1897
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Tire-setting machine
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Philippe Dènéry Dupont |
St. Johnsbury, VT |
This tire setter uses "a series of segmental pressure blocks operated by bell cranks levers connected to a central screw" where "depression of the inner ends of the series of bell crank levers forces the pressure blocks inward, which compresses the tire paced inside the circle of pressure blocks, reducing its diameter to suit the work required." The patent also covers the gearing used to work the central screw and nut. |
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642,070
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Jan. 30, 1900
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Power-hammer
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Edward H. Blossom |
St. Johnsbury, VT |
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