Granted Patent
Utility
US 4,969,706 · App. 07/343,100
Plenum cable which includes halogenated and non-halogenated plastic materials
Inventors:
Tommy G. Hardin, Behrooz A. Khorramian
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Apr 25, 1989
Inventors
Tommy G. Hardin
Behrooz A. Khorramian
Assignee (at issue)
AT&T Bell Laboratories
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.