US Patent 7217372 Magnetorheological composition

Patent 7217372 was granted and assigned to Lord Corporation on May, 2007 by the United States Patent and Trademark Office.

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Current Assignee

Lord Corporation

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7217372

Date of Patent

May 15, 2007

Patent Application Number

10286303

Date Filed

November 1, 2002

Patent Primary Examiner

‌

C Melissa Koslow

Patent abstract

The invention provides a magnetorheological device employing narrow design gap and containing a magnetic-responsive composition exhibiting reduced off-state forces and good performance. Specifically, this invention is directed to a magnetorheological device of defined gap, and employing a magnetic-responsive composition characterized by comprising non-sperical magnetic-responsive particles of average number diameter distribution (d50) from 6 to 100 microns and at least one friction-reducing additive that reduces the interparticle friction between the magnetic-responsive particles.

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