Granted Patent
Utility
US 4,845,658 · App. 06/936,641
Information method and apparatus using simplex and duplex communications
Inventor:
David K. Gifford
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Dec 1, 1986
Inventor
David K. Gifford
Assignee (at issue)
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
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.