Granted Patent
Utility
US 4,938,908 · App. 07/297,015
Flexible tube of thermoplastic resin having poor melt flowability and production method and apparatus thereof
Inventors:
Takeshi Shiraki, Yosihiro Yoshimura
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Jan 13, 1989
Inventors
Takeshi Shiraki
Yosihiro Yoshimura
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.