Granted Patent
Utility
US 5,116,898 · App. 07/583,402
Flame retardant polypropylene based formulations
Inventor:
Robert A. Schleifstein
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Sep 17, 1990
Inventor
Robert A. Schleifstein
Assignee (at issue)
Ethyl 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.