Granted Patent
Utility
US 4,477,638 · App. 06/482,016
Hindered phenolic esters of oligomeric glycols as chain terminators for polyvinyl chloride polymerization
Inventor:
William J. Reid
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Apr 11, 1983
Inventor
William J. Reid
Assignee (at issue)
Ciba-Geigy
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.