Granted Patent
Utility
US 4,414,580 · App. 06/268,847
Progressive transmission of two-tone facsimile
Inventors:
Ottar Johnsen, Arun N. Netravali
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: Jun 1, 1981
Inventors
Ottar Johnsen
Arun N. Netravali
Assignee (at issue)
Bell Telephone Laboratories, 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.