Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
June 17, 2008
Patent Application Number
11392305
Date Filed
March 29, 2006
Patent Primary Examiner
Patent abstract
An electromagnetic apparatus includes a solenoid having a movable core for being attracted to a fixed core when a coil is energized, a shaft coupled to the movable core for displacement in unison with the movable core, and a valve mechanism having a ball for selectively opening and closing a passageway between an inlet port and an outlet port in response to the displacement of the shaft. The movable core has a nonmagnetic layer formed on an outer surface thereof and having a predetermined thickness.
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