Propeller for watercraft and outboard motor

Details Propeller for watercraft and outboard motor Propeller for watercraft and outboard motor

2007-08-17

2011-12-20

Look, Edward (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Coating, specific composition or characteristic

C416S24400R

Reexamination Certificate

active

08079822

ABSTRACT:
A propeller for watercraft having excellent abrasion resistance and deformation resistance includes a propeller body having a blade and a hub portion, the propeller body being composed of an aluminum alloy and having a Vickers hardness of no less than about 60 Hv and no more than about 95 Hv; and an anodic oxide coating of the aluminum alloy provided so as to cover a surface of the propeller body. The anodic oxide coating has a thickness of no less than about 20 μm and no more than about 100 μm. Preferably, the anodic oxide coating has a hardness of no less than about 300 Hv and no more than about 450 Hv.

REFERENCES:
patent: 4692123 (1987-09-01), Tada et al.
patent: 4847048 (1989-07-01), Nishi et al.
patent: 2005/0100473 (2005-05-01), Ikuno et al.
patent: 2005/0163647 (2005-07-01), Donahue et al.
patent: 48095946 (1973-12-01), None
patent: 3029215 (1996-09-01), None
patent: 2005-139552 (2005-06-01), None
patent: 2006-207024 (2006-08-01), None
Toru Kitsunai et al.; “Propeller for Watercraft and Outboard Motor”; U.S. Appl. No. 11/840,254, filed Aug. 17, 2007.

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