Granted Patent
Utility
US 4,397,977 · App. 06/262,099
Tetrahalophthalates as flame retardant plasticizers for halogenated resins
Inventor:
Stanley R. Sandler
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: May 11, 1981
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.