Granted Patent
Utility
US 4,315,108 · App. 06/002,424
Integrated circuit chip telephone communication system
Inventors:
Gordon B. Hoffman, Michael Callahan
Patented Case
View Patent ↗
Granted: Feb 9, 1982
Filed: Jan 10, 1979
Inventors
Gordon B. Hoffman
Michael Callahan
Assignee (at issue)
Mostek 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.