Granted Patent
Utility
US 6,590,973 · App. 09/710,980
System and method for detecting an off-hook condition
Inventors:
Martin Bijman, Don Marlin
Patented Case
View Patent ↗
Granted: Jul 8, 2003
Filed: Nov 9, 2000
Inventors
Martin Bijman
Don Marlin
Assignee (at issue)
Catena Networks, 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.