Granted Patent
Utility
US 4,339,554 · App. 06/217,732
Polyvinyl chloride resin blends
Inventor:
Kenneth W. Doak
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Dec 18, 1980
Inventor
Kenneth W. Doak
Assignee (at issue)
Atlantic Richfield 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.