Granted Patent
Utility
US 4,729,023 · App. 06/917,290
Mode recognition for vertical countdown
Inventors:
Gopal K. Srivastava, Julian E. Warrick
Patented Case
View Patent ↗
Granted: Mar 1, 1988
Filed: Oct 9, 1986
Inventors
Gopal K. Srivastava
Julian E. Warrick
Assignee (at issue)
Zenith Electronics LLC
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.