Granted Patent
Utility
US 5,687,227 · App. 08/452,624
Telephone with user recorded ringing signal
Inventors:
Paul Wesley Cohrs, Donald Marion Keen
Patented Case
View Patent ↗
Granted: Nov 11, 1997
Filed: May 25, 1995
Inventors
Paul Wesley Cohrs
Donald Marion Keen
Assignee (at issue)
LUCENT TECHNOLOGIES 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.