Granted Patent
Utility
US 4,563,901 · App. 06/530,562
Transducer
Inventor:
Gurnam Singh
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: Sep 9, 1983
Inventor
Gurnam Singh
Assignee (at issue)
International Telephone and Telegraph 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.