Granted Patent
Utility
US 4,891,392 · App. 07/158,460
Production process of polyolefin resin composition containing inorganic filler
Inventors:
Masaru Abe, Yoichi Kawai, Minoru Hoshino, Katsumi Sekiguchi
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Feb 22, 1988
Inventors
Masaru Abe
Yoichi Kawai
Minoru Hoshino
Katsumi Sekiguchi
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.