Granted Patent
Utility
US 4,647,787 · App. 06/698,207
Backup battery power supply for microprocessor based telephones
Inventor:
Karl E. Pommer, II
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Feb 4, 1985
Inventor
Karl E. Pommer, II
Assignee (at issue)
GTE Communication Systems 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.