Granted Patent
Utility
US 4,159,509 · App. 05/803,798
Cathode depolarizer
Inventor:
Charles W. Walters
Patented Case
View Patent ↗
Granted: Jun 26, 1979
Filed: Jun 6, 1977
Inventor
Charles W. Walters
Assignee (at issue)
P. R. Mallory & Co. Inc.
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.