Granted Patent
Utility
US 4,298,517 · App. 06/068,987
Tetrahalophthalates as flame retardant plasticizers for halogenated resins
Inventor:
Stanley R. Sandler
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Aug 23, 1979
Inventor
Stanley R. Sandler
Assignee (at issue)
Pennwalt 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.