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. 25, 2010
Filed:
May. 17, 2005
Fujio Inoue, Tokyo, JP;
Fujio Inoue, Tokyo, JP;
Nippon Thermostat Co., Ltd, Kiyose-shi, JP;
Abstract
A thermostat device includes a valve housing with a cooling water passage of an internal combustion engine, a built-in thermally expansive body thermally expanded or contracted by temperature change of cooling water, a piston rod slid by thermal expansion/contraction of the expansive body, and a valve body subjected to opening/closing operation by the piston rod in accordance with volume change of the expansive body. A valve seat shape on downstream side than the valve seat, which is an internal wall face forming the passage is formed in a shape that in valve open condition the cross-sectional area of the passage between an inlet seal of the valve seat and the top face of the valve body gradually decreases with reference to the maximum passage cross-sectional area on upstream side and that the cross-sectional area of the passage at the face perpendicular to the top face gradually increases.