Marine propulsion – Jet drive
Reexamination Certificate
2005-02-22
2005-02-22
Sotelo, Jesus D. (Department: 3617)
Marine propulsion
Jet drive
C416S23100A, C440S047000
Reexamination Certificate
active
06857919
ABSTRACT:
An impeller for a jet propulsion device includes at least one fluid channel formed on each impeller blade. During impeller rotation, a fluid back-flow is generated through the fluid channels. The back-flow advantageously sweeps cavitation bubbles away from the impeller blades and inhibit their implosion on the blade surfaces and/or inner housing surface which lies adjacent the blade tips. This desirably reduces erosion and provides a long-life and efficient propulsion device.
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Co-pending patent application: U.S. Appl. No. 09/280,129, filed Mar. 26, 1999, entitled Induction System for Watercraft Engine, in the name of Ito et al., and assigned to Yamaha Hatsudoki Kabushiki Kaisha.
Henmi Yasuhiko
Yamamura Tadatsugu
Knobbe Martens Olson & Bear LLP
Sotelo Jesus D.
Yamaha Marine Kabushiki Kaisha
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