Granted Patent
Utility
US 5,219,913 · App. 07/753,973
Polypropylene-based resin composition
Inventors:
Ryuzo Tomomatsu, Takumasa Fukuda, Minoru Sugawara
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Sep 3, 1991
Inventors
Ryuzo Tomomatsu
Takumasa Fukuda
Minoru Sugawara
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.