Granted Patent
Utility
US 4,598,396 · App. 06/596,328
Duplex transmission mechanism for digital telephones
Inventors:
Daniel C. Upp, William G. Bartholomay
Patented Case
View Patent ↗
Granted: Jul 1, 1986
Filed: Apr 3, 1984
Inventors
Daniel C. Upp
William G. Bartholomay
Assignee (at issue)
ITT 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.