Granted Patent
Utility
US 5,115,030 · App. 07/388,927
Polypropylene resin composition
Inventors:
Mutsuhiro Tanaka, Masahiro Sugi
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Aug 3, 1989
Inventors
Mutsuhiro Tanaka
Masahiro Sugi
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.