Granted Patent
Utility
US 4,847,331 · App. 06/821,301
Method and composition for improved melt processability of chlorinated polyvinyl chloride
Inventor:
Marvin H. Lehr
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Jan 22, 1986
Inventor
Marvin H. Lehr
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.