Granted Patent
Utility
US 4,355,405 · App. 06/143,055
Digital signalling system
Inventors:
Willi A. H. Ruys, Dermod J. K. O'Reilly, Leopold P. Verbist, Daniel S. G. Hoefkens, Guido M. J. B. Thyssens
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Apr 23, 1980
Inventors
Willi A. H. Ruys
Dermod J. K. O'Reilly
Leopold P. Verbist
Daniel S. G. Hoefkens
Guido M. J. B. Thyssens
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.