Granted Patent
Utility
US 4,331,977 · App. 06/216,692
Portable television controller with electronic switching
Inventors:
William E. Cohn, Philip J. Nowaczyk
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Dec 15, 1980
Inventors
William E. Cohn
Philip J. Nowaczyk
Assignee (at issue)
Zenith Radio 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.