Granted Patent
Utility
US 5,844,983 · App. 08/891,126
Method and apparatus for controlling a telephone ring signal
Inventor:
Patrik Lilja
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Jul 10, 1997
Inventor
Patrik Lilja
Assignee (at issue)
ERICSSON GMBH
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.