Granted Patent
Utility
US 5,874,505 · App. 08/980,421
Polypropylene composition
Inventors:
Jun Saito, Naoshi Kawamoto, Akiko Kageyama, Kouichi Hatada, Yoshiyuki Oogi, Tsutomu Ushioda
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Nov 28, 1997
Inventors
Jun Saito
Naoshi Kawamoto
Akiko Kageyama
Kouichi Hatada
Yoshiyuki Oogi
Tsutomu Ushioda
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.