Granted Patent
Utility
US 4,427,847 · App. 06/291,655
Television/telephone system with annunciator and intercom feature
Inventors:
Judson A. Hofmann, Paul A. Snopko
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Aug 10, 1981
Inventors
Judson A. Hofmann
Paul A. Snopko
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.