Granted Patent
Utility
US 4,117,178 · App. 05/848,971
Phenolic antioxidants for non-polymeric halogen compounds during impregnation of styrene polymer particles
Inventor:
Walter O. Pillar
Patented Case
View Patent ↗
Granted: Sep 26, 1978
Filed: Nov 7, 1977
Inventor
Walter O. Pillar
Assignee (at issue)
Arco Polymers, Inc.
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.