Granted Patent
Utility
US 4,790,002 · App. 06/894,549
Telephone device and method for operating a telephone device
Inventors:
Nicholas A. D'Agosto, III, David B. Chamberlin
Patented Case
View Patent ↗
Granted: Dec 6, 1988
Filed: Aug 8, 1986
Inventors
Nicholas A. D'Agosto, III
David B. Chamberlin
Assignee (at issue)
Dictaphone 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.