Granted Patent
Utility
US 5,789,499 · App. 08/777,059
Polymerization process of vinyl chloride in the presence of oxygen
Inventors:
Seiichi Masuko, Yoshihiro Umeda, Katsuhito Kohketsu, Ichisaburo Nakamura, Akihiko Takahashi
Patented Case
View Patent ↗
Granted: Aug 4, 1998
Filed: Dec 30, 1996
Inventors
Seiichi Masuko
Yoshihiro Umeda
Katsuhito Kohketsu
Ichisaburo Nakamura
Akihiko Takahashi
Assignee (at issue)
MITSUI CHEMICALS, INC.
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.