Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
August 14, 2007
Patent Application Number
11258146
Date Filed
October 26, 2005
Patent Primary Examiner
Patent abstract
A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.
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