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:
Jul. 23, 2002
Filed:
Jul. 07, 2000
Applicant:
Inventor:
Louis C. Harms, Evanston, IL (US);
Assignee:
Parker-Hannifin Corporation, Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 3/108 ;
U.S. Cl.
CPC ...
F16K 3/108 ;
Abstract
A solenoid valve includes an armature having two permanent magnets axially spaced apart with a steel spacer therebetween. The permanent magnets act as magnetic flux diodes to reduce or prevent undesired forces on the armature due to parasitic magnetic flux. The magnets have stepped outer ends which, in conjunction with pole pieces having corresponding stepped pole piece ends, concentrate magnetic flux to increase the magnetic force on the armature.