Granted Patent
Utility
US 4,210,404 · App. 05/847,569
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Inventor:
William A. Hanger
Patented Case
View Patent ↗
Granted: Jul 1, 1980
Filed: Nov 1, 1977
Inventor
William A. Hanger
Assignee (at issue)
General Electric Company
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.