Granted Patent
Utility
US 4,983,665 · App. 07/443,788
Flexible blend compositions based on overpolymers of vinyl chloride polymers on ethylene copolymers
Inventor:
Richard H. Backderf
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Nov 30, 1989
Inventor
Richard H. Backderf
Assignee (at issue)
B. F. Goodrich 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.