Granted Patent
Utility
US 4,791,663 · App. 07/161,254
Telephone status recognition and bypass system
Inventors:
David T. Rockne, Lowell E. Johnson
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Feb 22, 1988
Inventors
David T. Rockne
Lowell E. Johnson
Assignee (at issue)
Telident, Incorporated
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.