Granted Patent
Utility
US 4,792,588 · App. 07/019,317
Polyethylene composition
Inventors:
Michiharu Suga, Hideo Ishikawa, Yoshinori Akana, Junichi Yoshitake, Masayuki Kondoh
Patented Case
View Patent ↗
Granted: Dec 20, 1988
Filed: Apr 17, 1987
Inventors
Michiharu Suga
Hideo Ishikawa
Yoshinori Akana
Junichi Yoshitake
Masayuki Kondoh
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.