Granted Patent
Utility
US 4,243,847 · App. 06/034,522
Automatic restoral mechanism for a pushbutton key telephone instrument
Inventor:
Babulal V. Gala
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Apr 30, 1979
Inventor
Babulal V. Gala
Assignee (at issue)
GTE Automatic Electric Laboratories, 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.