Granted Patent
Utility
US 5,656,691 · App. 08/403,627
Reformed polypropylene resin composition and a method of preparing the same
Inventors:
Yasuhiro Niki, Toshio Kobayashi, Takashi Arai
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Mar 14, 1995
Inventors
Yasuhiro Niki
Toshio Kobayashi
Takashi Arai
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.