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:
Mar. 12, 1985
Filed:
Mar. 30, 1982
Applicant:
Inventors:
Takatoshi Yoshioka, Hitachi, JP;
Seishin Kirihara, Hitachi, JP;
Masao Siga, Hitachi, JP;
Takehiko Yoshida, Hitachi, JP;
Katsukuni Hisano, Hitachi, JP;
Toshimi Tan, Hitachi, JP;
Masahiro Kobayashi, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ; B23K / ; F01D / ; F01D / ;
U.S. Cl.
CPC ...
428683 ; 428684 ; 148127 ;
Abstract
A steam turbine rotor shaft comprising the main body of the rotor shaft made of a high Cr steel of martensite structure, and a journal having a plurality of built-up welding layers formed successively said main body, the outer surface portion of the journal being made of steel containing 0.5 to 3 wt % of Cr, and a method of producing same.