Granted Patent
Utility
US 5,120,768 · App. 07/697,857
Process for separating polyethylene terephthalate from polyvinyl chloride
Inventor:
Edwin A. Sisson
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: May 9, 1991
Inventor
Edwin A. Sisson
Assignee (at issue)
THE GOODYEAR TIRE & RUBBER COMPANY
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.