Granted Patent
Utility
US 4,484,031 · App. 06/390,536
Interface circuit for a telephone system
Inventors:
Jerry B. Gray, Cuba M. Adams, Larry B. Christensen
Patented Case
View Patent ↗
Granted: Nov 20, 1984
Filed: Jun 21, 1982
Inventors
Jerry B. Gray
Cuba M. Adams
Larry B. Christensen
Assignee (at issue)
Zale 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.