Granted Patent
Utility
US 5,247,012 · App. 07/447,940
Glutaric acid based polyester internally plasticized PVC
Inventor:
Josef C. Vyvoda
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Dec 8, 1989
Inventor
Josef C. Vyvoda
Assignee (at issue)
The Geon 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.