Granted Patent
Utility
US 5,147,948 · App. 07/631,932
Method for polymerizing vinyl chloride while inhibiting adhesion to the polymerization reactor with coating from poly(hydricphenol sulfide)
Inventors:
Seiichi Masuko, Ichisaburo Nakamura, Keiichi Fukuda, Yasuyuki Hatakeyama, Akihiro Yamaguchi, Keizaburo Yamaguchi
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Dec 21, 1990
Inventors
Seiichi Masuko
Ichisaburo Nakamura
Keiichi Fukuda
Yasuyuki Hatakeyama
Akihiro Yamaguchi
Keizaburo Yamaguchi
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.