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. 17, 2007
Filed:
Mar. 01, 1999
Akira Koide, Chofu, JP;
Ryo Miyake, Tsukuba, JP;
Takao Terayama, Ushiku, JP;
Hiroshi Mitsumaki, Mito, JP;
Tomonari Morioka, Hitachinaka, JP;
Akira Koide, Chofu, JP;
Ryo Miyake, Tsukuba, JP;
Takao Terayama, Ushiku, JP;
Hiroshi Mitsumaki, Mito, JP;
Tomonari Morioka, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided is a liquid feed apparatus for feeding liquid by operating a diaphragm at a high frequency, in which an inlet valve and an outlet valve are integrally incorporated with a liquid feed chamber, the positions of the valve are shifted into peripheral parts of the liquid feed chamber so as to allow fluid to smoothly flow from the inlet to the outlet in order to prevent air bubbles from causing pressure fluctuation during liquid feed, from remaining in the liquid feed chamber. Further, the valve has a center beam structure in which a protrusion having a height greater than several micron meters, is formed in the seat part of the valve so as to deform a center beam for pressurizing the valve in order to enhance the shut-off ability of the valve, and the center beam has a small surface area in the direction of displacement of the valve.