Granted Patent
Utility
US 4,314,039 · App. 06/175,726
Polypropylene composition containing a 1.3,2.4-di(alkylbenzylidene) sorbitol
Inventors:
Yoichi Kawai, Katsuyoshi Sasagawa, Masami Maki, Hozumi Ueda, Masayoshi Miyamoto
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Aug 6, 1980
Inventors
Yoichi Kawai
Katsuyoshi Sasagawa
Masami Maki
Hozumi Ueda
Masayoshi Miyamoto
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.