Granted Patent
Utility
US 5,506,891 · App. 08/454,405
Method and apparatus for detecting the connection status of an extension phone connected to a voice/fax/data modem
Inventor:
Paul M. Brown
Patented Case
View Patent ↗
Granted: Apr 9, 1996
Filed: May 30, 1995
Inventor
Paul M. Brown
Assignee (at issue)
Cirrus Logic Inc.
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.