Granted Patent
Utility
US 4,292,473 · App. 06/064,344
Loop supervision circuit
Inventors:
Jan H. G. Venken, Jozef A. M. Robijns
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Aug 6, 1979
Inventors
Jan H. G. Venken
Jozef A. M. Robijns
Assignee (at issue)
International Standard Electric 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.