Granted Patent
Utility
US 4,948,841 · App. 07/263,803
Propylene polymer composition
Inventors:
Toshikazu Kasahara, Hideo Funabashi
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Oct 28, 1988
Inventors
Toshikazu Kasahara
Hideo Funabashi
Assignee (at issue)
Idemitsu Petrochemical Co., 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.