Granted Patent
Utility
US 5,423,133 · App. 08/061,367
Drying hopper for polymer powder
Inventors:
Yoshiaki Annen, Akira Tsuzaki, Isao Shizuma, Takao Uetake, Mitsunori Ichimura
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: May 14, 1993
Inventors
Yoshiaki Annen
Akira Tsuzaki
Isao Shizuma
Takao Uetake
Mitsunori Ichimura
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.