Propeller for watercraft, outboard motor and watercraft...

Details Propeller for watercraft, outboard motor and watercraft... Propeller for watercraft, outboard motor and watercraft...

2007-12-19

2011-12-27

Edgar, Richard (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Coating, specific composition or characteristic

Reexamination Certificate

active

08083490

ABSTRACT:
A propeller for watercraft having excellent abrasion resistance includes a propeller body having a blade and a hub portion, the propeller body being molded from an aluminum alloy by casting, 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 about 20 μm or more in a thinnest portion and a hardness of about 330 HV or more at a near-surface level in a thickest portion.

REFERENCES:
patent: 3744931 (1973-07-01), Cavanagh
patent: 07-034292 (1995-02-01), None
patent: 07-207467 (1995-08-01), None
patent: 3029215 (1996-09-01), None
patent: 09-001319 (1997-01-01), None

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