Granted Patent
Utility
US 5,298,551 · App. 07/849,075
Vinyl chloride resin compositions
Inventor:
Youzo Yamamoto
Patented Case
View Patent ↗
Granted: Mar 29, 1994
Filed: Apr 28, 1992
Inventor
Youzo Yamamoto
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.