Granted Patent
Utility
US 4,626,565 · App. 06/722,013
Preparation process for polypropylene-base resin compositions
Inventors:
Yoichi Kawai, Masaru Abe, Katsumi Sekiguchi, Akio Yoshihara, Shigeru Hayashi
Patented Case
View Patent ↗
Granted: Dec 2, 1986
Filed: Mar 29, 1985
Inventors
Yoichi Kawai
Masaru Abe
Katsumi Sekiguchi
Akio Yoshihara
Shigeru Hayashi
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.