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. 11, 2004
Filed:
Aug. 19, 2002
Applicant:
Inventors:
Mitsugu Ota, Nagano, JP;
Takashi Koase, Nagano, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B 4/308 ; F04B 4/312 ; B41J 2/175 ;
U.S. Cl.
CPC ...
F04B 4/308 ; F04B 4/312 ; B41J 2/175 ;
Abstract
A groove wall of a roller support groove opened to both end faces of a pump wheel comprises such a cam face wherein a roller rotates and rolls and is displaced from release operation position a to pump operation position b with rotation of the pump wheel in a pump operation direction from a release operation state and wherein the roller remains immobile and is displaced from the pump operation position b to the release operation position a with rotation of the pump wheel in a release operation direction from a pump operation state.