The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 1991
Filed:
Jun. 20, 1989
Applicant:
Inventors:
Kenichi Usami, Hitachi, JP;
Kooji Satoo, Hitachi, JP;
Hiroshi Takayasu, Ibaraki, JP;
Michihiro Takata, Odawara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B63H / ; F03B / ;
U.S. Cl.
CPC ...
4162 / ; 415200 ; 4152171 ;
Abstract
A water turbine used in river water which is comparatively rich in soil and sand particles. In order to improve the resistance to erosion due to cavitation, as well as erosion caused by mechanical action of the soil and sand particles, a water contactable portion of the water turbine, in particular a portion of each moving blade which tends to be eroded is formed of a stainless steel containing 0.07 to 0.2 wt % of C, not more than 2 wt % of Si, 7 to 15 wt % of Mn, 1 to 7 wt % of Ni, 10 to 25 wt % of Cr, 0.1 to 3 wt % of W, and the balance substantially Fe and inevitably accompanying impurities.