Granted Patent
Utility
US 6,319,991 · App. 09/081,678
Propylene polymer blends, processes of producing the same and polypropylene resin compositions
Inventors:
Chikashi Okayama, Takanori Nakashima, Shinichi Akitaya, Yoshitaka Sumi
Patented Case
View Patent ↗
Granted: Nov 20, 2001
Filed: May 20, 1998
Inventors
Chikashi Okayama
Takanori Nakashima
Shinichi Akitaya
Yoshitaka Sumi
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.