Granted Patent
Utility
US 4,580,009 · App. 06/608,330
Telephone mouthpiece modular coupler
Inventor:
Michael L. Darland
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: May 8, 1984
Inventor
Michael L. Darland
Assignee (at issue)
The Microperipherel 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.