Granted Patent
Utility
US 5,227,417 · App. 07/825,592
Polyvinyl chloride based plenum cable
Inventor:
Paul Kroushl
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jan 24, 1992
Inventor
Paul Kroushl
Assignee (at issue)
Cooper Industries Holdings
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.