Granted Patent
Utility
US 5,832,075 · App. 08/839,091
Off-hook detector for headset
Inventor:
Ed Gancarcik
Patented Case
View Patent ↗
Granted: Nov 3, 1998
Filed: Apr 23, 1997
Inventor
Ed Gancarcik
Assignee (at issue)
Mitel 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.