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:
Apr. 12, 2005
Filed:
Apr. 07, 2004
Applicants:
Hiroyuki Yao, Okazaki, JP;
Hidetoshi Fujiwara, Nukata-gun, JP;
Kentaro Yamauchi, Okazaki, JP;
Inventors:
Assignee:
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04C018/00 ;
U.S. Cl.
CPC ...
Abstract
Within an angular area where each vane of a vane pump having backpressure grooves is moved radially inwardly as the rotor rotates, the outer circumferential edge of the backpressure groove is indented toward the rotational axis of the rotor along a locus drawn by the radial innermost end of each vane so that the radial innermost end of each vane does not protrude radially inwardly beyond a predetermined distance from the indented part of the outer circumferential edge of the backpressure groove.