Granted Patent
Utility
US 4,626,627 · App. 06/540,135
Telephone line selector for use with a PBX
Inventors:
Frank van Gilluwe, Samuel B. Dunham, Douglas A. Cross
Patented Case
View Patent ↗
Granted: Dec 2, 1986
Filed: Oct 7, 1983
Inventors
Frank van Gilluwe
Samuel B. Dunham
Douglas A. Cross
Assignee (at issue)
TELEDEX, 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.