Granted Patent
Utility
US 4,435,622 · App. 06/437,932
Latching relay hold circuit for a telephone instrument
Inventors:
Gary Grantland, Eduard F. B. Boeckmann
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Nov 1, 1982
Inventors
Gary Grantland
Eduard F. B. Boeckmann
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.