Granted Patent
Utility
US 4,669,090 · App. 06/752,402
Half-duplex modem without turnaround delay
Inventors:
William L. Betts, Kenneth Martinez
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Jul 5, 1985
Inventors
William L. Betts
Kenneth Martinez
Assignee (at issue)
PARADYNE 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.