Granted Patent
Utility
US 4,972,035 · App. 07/317,055
Process for preparing ultra-high-molecular-weight polyolefin fine powder
Inventors:
Michiharu Suga, Mamoru Kioka, Toshio Kobayashi, Akifumi Kato, Michio Endo
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Feb 24, 1989
Inventors
Michiharu Suga
Mamoru Kioka
Toshio Kobayashi
Akifumi Kato
Michio Endo
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.