Granted Patent
Utility
US 4,453,042 · App. 06/452,588
Telephone station signaling lock circuit
Inventors:
Ann L. Wolf, John G. Wagoner
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Dec 23, 1982
Inventors
Ann L. Wolf
John G. Wagoner
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.