Granted Patent
Utility
US 4,811,381 · App. 07/119,395
Direct inward dial integration apparatus
Inventors:
Donald E. Woo, Paul M. Barnett
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Nov 10, 1987
Inventors
Donald E. Woo
Paul M. Barnett
Assignee (at issue)
Octel Communications 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.