Granted Patent
Utility
US 4,418,396 · App. 06/145,394
Signalling system
Inventors:
Goran A. H. Hemdal, Jonny S. Jager
Patented Case
View Patent ↗
Granted: Nov 29, 1983
Filed: May 1, 1980
Inventors
Goran A. H. Hemdal
Jonny S. Jager
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.