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:
May. 22, 2007
Filed:
Sep. 12, 2003
Applicants:
Francois Paquet, Champagnier, FR;
Bernard Michel, Vaulnaveys le Bas, FR;
Inventors:
Francois Paquet, Champagnier, FR;
Bernard Michel, Vaulnaveys le Bas, FR;
Assignee:
Alstom Technology Ltd., Baden, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B63H 1/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
A Francis runner that includes a crown, a band and blades which extend between the crown and the band. An angle (β) between a linear speed (U, D) of one of the blades and a median of the blade at the trailing edge, has a value between 20 and 25°. As a result, a machine utilizing the Francis runner of the invention is efficient, while an equivalent power under high load is high.