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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2,977,040
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Mar. 28, 1961
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Pneumatic pressure boosting apparatus
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David H. Dulebohn |
Minneapolis, MN |
The invention is an air compressor that is operated by compressed air. Canada patent 658,136 is equivalent to this US patent.
This patent number was seen in a Dayton Rogers catalog on their Model H-4 (max 200 psi output) and H-4B (max 300 psi output) Pneumatic Booster Pump. The primary use case mentioned in the patent is for providing high pressure air to that company's pneumatic die cushions. |
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Pneumatic pressure boosting apparatus
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Robert M. Gold |
Minneapolis, MN |
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3,013,791
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Dec. 19, 1961
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Die cushion
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Robert M. Gold |
Minneapolis, MN |
This patent number was seen in a catalog from Dayton Rogers Mfg. Co. for their Model MC pneumatic die cushions, which have dual pressured chambers capable of exerting twice the pressure of other models of similar size. |
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Die cushion
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Herbert D. Carlson |
Minneapolis, MN |
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3,084,576
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Apr. 09, 1963
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Apparatus for trimming drawn sheet metal shells and the like
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David H. Dulebohn |
Minneapolis, MN |
This patent was used on Dayton Rogers' ST-4 Sliding Knife Drawn Shell Trimmer. |
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Apparatus for trimming drawn sheet metal shells and the like
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Robert M. Gold |
Minneapolis, MN |
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