Granted Patent
Utility
US 4,637,035 · App. 06/580,672
Digital modem for multiple telephone circuits
Inventor:
William L. Betts
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: Feb 16, 1984
Inventor
William L. Betts
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.