Granted Patent
Utility
US 4,773,837 · App. 06/877,247
Screw pump
Inventors:
Atsushi Shimomura, Hitoshi Tsuihiji, Yasuo Hirooka
Patented Case
View Patent ↗
Granted: Sep 27, 1988
Filed: Jun 23, 1986
Inventors
Atsushi Shimomura
Hitoshi Tsuihiji
Yasuo Hirooka
Assignee (at issue)
KAWASAKI JUKOGYO KABUSHIKI KAISHA
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.