Granted Patent
Utility
US 5,127,004 · App. 07/408,165
Tone and announcement message code generator for a telephonic switching system and method
Inventors:
John P. Lenihan, Mai Nguyen
Patented Case
View Patent ↗
Granted: Jun 30, 1992
Filed: Sep 15, 1989
Inventors
John P. Lenihan
Mai Nguyen
Assignee (at issue)
Rockwell International 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.