Granted Patent
Utility
US 5,417,561 · App. 08/163,078
Apparatus for manufacturing of ultra high molecular weight polyethylene thin wall pipe
Inventors:
Takeshi Shiraki, Iwatosi Suzuki, Kunie Hiroshige
Patented Case
View Patent ↗
Granted: May 23, 1995
Filed: Dec 8, 1993
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.