Granted Patent
Utility
US 6,489,426 · App. 09/643,742
Propylene base polymer and a polypropylene film using the same
Inventors:
Naoshi Kawamoto, Yasuhiro Shiraishi, Atsuko Sawai, Yuji Ando, Shinji Nakata, Hisanobu Minamizawa, Ichiro Sakabe, Katsuhiko Ohno
Patented Case
View Patent ↗
Granted: Dec 3, 2002
Filed: Aug 23, 2000
Inventors
Naoshi Kawamoto
Yasuhiro Shiraishi
Atsuko Sawai
Yuji Ando
Shinji Nakata
Hisanobu Minamizawa
Ichiro Sakabe
Katsuhiko Ohno
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.