Granted Patent
Utility
US 5,406,584 · App. 07/937,740
Time shift keying digital communications system
Inventor:
David E. Erisman
Patented Case
View Patent ↗
Granted: Apr 11, 1995
Filed: Sep 1, 1992
Inventor
David E. Erisman
Assignee (at issue)
X.com.Inc
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.