Granted Patent
Utility
US 4,675,902 · App. 06/778,995
High performance telephone instrument with combination pulse and tone dialing capacity
Inventor:
Eduard F. B. Boeckmann
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Sep 23, 1985
Inventor
Eduard F. B. Boeckmann
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.