Granted Patent
Utility
US 4,481,640 · App. 06/422,466
Spread spectrum modem
Inventors:
Sherman M. Chow, Pok F. Lee
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Sep 23, 1982
Inventors
Sherman M. Chow
Pok F. Lee
Assignee (at issue)
Canadian Patents and Development Limited
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.