Granted Patent
Utility
US 4,351,619 · App. 06/211,228
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Inventors:
Douglas Duke, Reinhold Drodofsky, Folker Galaske
Patented Case
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Granted: Sep 28, 1982
Filed: Nov 28, 1980
Inventors
Douglas Duke
Reinhold Drodofsky
Folker Galaske
Assignee (at issue)
International Standard Electric Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.