Granted Patent
Utility
US 5,683,767 · App. 08/394,950
Ultra-high molecular weight polyethylene thin-wall pipe, and method of an apparatus for manufacturing the same
Inventors:
Takeshi Shiraki, Iwatosi Suzuki, Kunie Hiroshige
Patented Case
View Patent ↗
Granted: Nov 4, 1997
Filed: Feb 27, 1995
Inventors
Takeshi Shiraki
Iwatosi Suzuki
Kunie Hiroshige
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.