US PATENT SUBCLASS 521 / 57
.~.~.~ Including step of surface coating a particle or process of expanding a surface coated particle


Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
56  DF  .~.~ Particle which is expandible, process of preparing an expandible particle, or process of expanding a particle to form a cellular product {4}
57.~.~.~ Including step of surface coating a particle or process of expanding a surface coated particle


DEFINITION

Classification: 521/57

Including step of surface coating a particle or process of expanding a surface coated particle:

(under subclass 56) Subject matter wherein (1) a particle of a solid polymeric material is surface coated and wherein the particle or the coating is expandable or is expanded in a later processing step; or (2) a particle is coated with a polymeric containing material and the base or coating is expandable or expanded in a later processing step.

(1) Note. The coating may be continuous or discontinuous. It may be formed from a solid as in a powder coating or may be formed from a fluent.

(2) Note. The surface coating may be applied precedent to or subsequent to a step of impregnating a particle with a blowing agent.