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:
Nov. 15, 1988
Filed:
Jun. 05, 1986
Applicant:
Inventors:
Toshihiro Takei, Okazaki, JP;
Yoshiyuki Hattori, Toyoake, JP;
Yutaka Kawashima, Okazaki, JP;
Tetuya Izumi, Kariya, JP;
Yoshifumi Ina, Okazaki, JP;
Takeshi Matsuda, Aichi, JP;
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ; F04B / ;
U.S. Cl.
CPC ...
4174236 ; 41742314 ; 4174231 ;
Abstract
A pump apparatus comprises a pump housing, an impeller having a plurality of radial grooves rotatably disposed within the pump housing, first and second fluid passages each defined by the impeller and the pump housing at both sides of the impeller, a motor having an output shaft for driving the impeller, a first radial clearance between the impeller and the output shaft of the motor, and a second radial clearance between an outer peripheral surface of the impeller and the pump housing, which is smaller than the first clearance.