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. 10, 2009
Filed:
Mar. 26, 2007
Junichi Uehara, Otsu, JP;
Kazukiyo Teshima, Sanda, JP;
Junichi Uehara, Otsu, JP;
Kazukiyo Teshima, Sanda, JP;
Toray Engineering Co., Ltd., Tokyo, JP;
Nippon Pillar Packing Co., Ltd., Osaka, JP;
Abstract
A pistonwhich is to be movably supported in a cylinderof a pumpto be reciprocally driven is formed by a fluororesin so that it is not impaired by a corrosive liquid. A cylindrical outer peripheral portionof the pistonhas a thickness of 1 mm or less, and is flexible. The outer peripheral portion has a flange portionin an open end portion via an approximately 180-degree folded-back portion. The flange portionis attached to the cylinder. When the pumpis driven, the cylindrical outer peripheral portionof the pistonsmoothly rolls without producing deflections or bends in a gap between the outer peripheral face of a piston support memberand the inner peripheral face of the cylinder, while being in close contact with the two faces.