Granted Patent
Utility
US 4,864,605 · App. 07/165,217
Telephone trunk interface circuit
Inventors:
John W. Ramsay, Thomas Ouellette
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: Mar 8, 1988
Inventors
John W. Ramsay
Thomas Ouellette
Assignee (at issue)
International Telesystems, 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.