Granted Patent
Utility
US 5,544,243 · App. 08/288,941
Telephone headset interface circuit
Inventor:
Costas Papadopoulos
Patented Case
View Patent ↗
Granted: Aug 6, 1996
Filed: Aug 10, 1994
Inventor
Costas Papadopoulos
Assignee (at issue)
VXi 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.