Granted Patent
Utility
US 4,298,841 · App. 06/075,616
Signal envelope detecting system
Inventor:
Milton Dishal
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Sep 14, 1979
Inventor
Milton Dishal
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.