Granted Patent
Utility
US 4,453,040 · App. 06/452,587
Telephone feature assignment circuit
Inventors:
Ann L. Wolf, Louis W. Smith
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Dec 23, 1982
Inventors
Ann L. Wolf
Louis W. Smith
Assignee (at issue)
GTE Automatic Electric Incorporated
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.