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. 09, 1999
Filed:
Nov. 14, 1996
Kenichi Usami, Hitachi, JP;
Hiroshi Takayasu, Ibaraki, JP;
Tsutomu Onuma, Hitachi, JP;
Makoto Kanda, Ibaraki, JP;
Masao Kawakami, Hitachinaka, JP;
Fumio Sakamoto, Ibaraki, JP;
Tsugio Fushimi, Hitachinaka, JP;
Tsugio Yoshikawa, Hitachi, JP;
Hitachi, Ltd., , JP;
Abstract
An ultra high head pumpturbine power generating plant with a turbine having a runner rotating with water flow supplied through a high head conducting tube. A rotary electric machine rotates with rotation of the runner. The head is in the range of 400-600 m, and the runner is at least 5 meters in diameter. The said runner has characteristics of toughness at room temperature: at least 500 N/mm.sup.2, or tensile strength at room temperature: at least 650 N/mm.sup.2, elongation at least 16%, reduction of area at least 45%, 2 mm U-notch impact value at 0.degree. C. at least 100 J, and fracture toughness at least 6000 N/mm.sup.3/2.