Granted Patent
Utility
US 4,644,579 · App. 06/746,151
Shunt regulator for hands-free telephone
Inventor:
Edward J. W. Whittaker
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Jun 18, 1985
Inventor
Edward J. W. Whittaker
Assignee (at issue)
International Standard Electric 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.