Plastic and nonmetallic article shaping or treating: processes – Forming electrical articles by shaping electroconductive...
Reexamination Certificate
2004-06-08
2008-11-18
Huson, Monica A (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Forming electrical articles by shaping electroconductive...
C264S108000, C264S427000, C264S429000, C264S435000, C264S436000, C264S437000, C264S478000, C425S003000
Reexamination Certificate
active
07452492
ABSTRACT:
A method of fabricating a magnetic coder device, the method being of the type consisting in making a mixture of ferromagnetic particles or ferrites in a matrix, in molding the matrix, and in subjecting the molded matrix to a magnetic field so as to obtain a continuous alternation of north and south magnetic poles, which method consists in using a matrix having viscosity that is sufficiently low to enable the ferrites to migrate, in applying a magnetic field during the molding operation while maintaining the matrix at a given temperature in order to reduce its viscosity and thereby making it easier to cause the ferromagnetic particles to migrate and become oriented in their direction of easy magnetization, and to obtain discontinuous shapes having high particle concentration, and in suddenly cooling the matrix while the magnetic field is maintained so as to freeze the particles in the matrix.
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Argy Gilles
Sautier Pascal
Alston & Bird LLP
Huson Monica A
Hutchinson
Wollschlager Jeff
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