Granted Patent
Utility
US 4,646,286 · App. 06/761,925
Communications system with protection switching and channel identities
Inventors:
David I. Reid, John C. Ellson, Malcolm Betts
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Aug 2, 1985
Inventors
David I. Reid
John C. Ellson
Malcolm Betts
Assignee (at issue)
Nortel Networks Limited
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.