Granted Patent
Utility
US 4,497,980 · App. 06/505,428
Handsfree circuit for telephone instrument
Inventors:
Patrick R. Gorman, William O. Stottlemyer
Patented Case
View Patent ↗
Granted: Feb 5, 1985
Filed: Jun 16, 1983
Inventors
Patrick R. Gorman
William O. Stottlemyer
Assignee (at issue)
ITT 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.