J M Winstead5858 Beaufort Ln, Indianapolis, IN 46254
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5858 Beaufort Ln, Indianapolis, IN 46254 317-2901488
2550 Cold Spring Rd, Indianapolis, IN 46222
Bloomington, IN
699 Connors Dr, Greenwood, IN 46143 317-8815384
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Us Patents
Magnetically-Responsive Microparticles With Improved Response Times
US Patent:
7989065, Aug 2, 2011
Filed:
May 18, 2006
Appl. No.:
11/436680
Inventors:
J Winstead - Indianapolis IN, US
William L. Grimm - Indianapolis IN, US
William L. Grimm - Indianapolis IN, US
Assignee:
Seradyn, Inc. - Indianapolis IN
International Classification:
B32B 5/16
US Classification:
428403, 428404, 428405, 428406, 428407, 427127, 427128, 427129, 427130, 427212
Abstract:
Magnetically responsive particles can include two or more magnetically responsive layers (“MRL”). As such, the particles can have the following: a polymeric core; a first magnetically responsive layer (“MRL”) on the core; a first polymeric layer bound to the first MRL; a second MRL layer bound to the first polymeric layer; and a second polymeric layer bound to the second MRL. The particles can have a faster magnetic response time compared to a similar particle having only a single MRL, which can be at least 25% faster. Also, the particle can have a magnetic squareness of less than about 0. 1. Preferably, the particle can have negligible residual magnetism after being exposed to a magnetic field sufficient for the particle to respond thereto. Further, the particle can be colloidally stable in water at concentrations from about 0. 1 to 10 grams of particle per 100 milliliters of water.
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