Granted Patent
Utility
US 4,957,983 · App. 07/362,627
Method for providing improved colloidal stability and polyvinyl chloride using a hot charge polymerization procedure with emulsifier package
Inventors:
Roman B. Hawrylko, Richard A. Widdifield
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Jun 7, 1989
Inventors
Roman B. Hawrylko
Richard A. Widdifield
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.