Granted Patent
Utility
US 5,756,193 · App. 08/623,147
Polyethylene resin composition for heavy-duty packaging bag and polyethylene resin film produced from the same
Inventors:
Akihiko Yamamoto, Naoshi Hamada, Toshihiro Nishimura, Kouji Kitahara
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: Mar 28, 1996
Inventors
Akihiko Yamamoto
Naoshi Hamada
Toshihiro Nishimura
Kouji Kitahara
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.