Granted Patent
Utility
US 5,057,261 · App. 07/431,833
Process for producing modified ultrahigh-molecular-weight polyolefins
Inventors:
Yoshiji Ohori, Hirofumi Harazoe
Patented Case
View Patent ↗
Granted: Oct 15, 1991
Filed: Nov 6, 1989
Inventors
Yoshiji Ohori
Hirofumi Harazoe
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.