Granted Patent
Utility
US 6,531,551 · App. 09/214,798
Polypropylene composition, process for preparing the same, and polymerization catalyst therefor
Inventors:
Katsuhiko Ohno, Masami Kimura, Taketo Hirose, Yoshitaka Morimoto, Jun Saito
Patented Case
View Patent ↗
Granted: Mar 11, 2003
Filed: Jan 11, 1999
Inventors
Katsuhiko Ohno
Masami Kimura
Taketo Hirose
Yoshitaka Morimoto
Jun Saito
Assignee (at issue)
Chisso Corporation
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.