Granted Patent
Utility
US 4,601,048 · App. 06/596,117
Serial minimum shift-keyed modem
Inventor:
Carl R. Ryan
Patented Case
View Patent ↗
Granted: Jul 15, 1986
Filed: Apr 2, 1984
Inventor
Carl R. Ryan
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.