Granted Patent
Utility
US 4,238,849 · App. 05/970,835
Method of and system for transmitting two different messages on a carrier wave over a single transmission channel of predetermined bandwidth
Inventor:
Gerhard-Gunter Gassmann
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Dec 19, 1978
Inventor
Gerhard-Gunter Gassmann
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.