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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2,826,540
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Mar. 11, 1958
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Method and apparatus for electrolytic cutting, shaping, and grinding
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George F. Keeleric |
Evanston, IL |
See patent 3,004,910 for more information on this notable patent, which the inventor developed to sharpen carbide cutting tools. A 1958 issue of American Machinist (Vol. 102 p. 65) mentions this patent and says, "Anocut Engineering, Chicago, is licensee"; that firm would be the first to introduce a commercial ECM machine. American Machinist & Automated Manufacturing: Jan. 1986-July 1988, Volume 111, page 98, mentions Keeleric's development of electrochemical machining (ECM), and says, "Then in 1959 came the first ECM production machines, and electrochemical machining was on its way to becoming an established metalworking tool." Since then, electrical discharge machining (EDM) has become an important machining technique whereas ECM remains confined to niche applications such as making turbine blades and deburring parts made from hard metals. |
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3,004,910
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Oct. 17, 1961
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Apparatus for electrolytic cutting, shaping and grinding
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George F. Keeleric |
Dundee, IL |
Improvements to the inventor's patent 2,826,540. These two patents together can be considered the seminal patents related to electrochemical machining, which involves passing a high current through the workpiece and a rapidly rotating disc with an electrolytic fluid in the small gap between the two. The workpiece is connected to the positive side of the DC power and the disc to the negative. The voltage is low to minimize arcing but the current is generally in the range of 200 to 1000 amperes per square inch, and the material removal rate will be proportional to the current density. The patent provides a number of refinements to minimize arcing and to provide a smooth finished surface while achieving high rates of stock removal. |