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:
Jan. 16, 2007
Filed:
Jul. 12, 2004
Masao Kajitani, Ibaraki, JP;
Masao Kajitani, Ibaraki, JP;
SMC Corporation, Tokyo, JP;
Abstract
A vacuum regulating valve which is simplified in structure and where the flow rate characteristic in evacuating a vacuum vessel is improved, comprises (i) a main valveA of a large size which has: a principal bodyhaving two main portsconnected to a vacuum vesseland a vacuum pump, respectively, a valve seatdisposed in a fluid passage connecting the ports, a valve elementseated on and separated from the valve seat, and a shaftextending from the valve element; and a valve element operating unitfor operating the valve elementvia the shaft, and (ii) a sub valveA of a small size similar in structure to the main valveA. The sub valveA is attached to an outer side surface of a casingof the main valveA.