US PATENT SUBCLASS 521 / 59
.~.~.~ Expandible system contains two or more solid polymers or at least one solid polymer and at least one polymer-forming system

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
59.~.~.~ Expandible system contains two or more solid polymers or at least one solid polymer and at least one polymer-forming system

DEFINITION

Classification: 521/59

Expandable system contains two or more solid polymers or at least one solid polymer and at least one polymer-forming system:

(under subclass 56) Subject matter wherein two or more solid polymers are present during the cell-forming operation, or wherein, in addition to the solid particulate polymer, additional polymer-forming ingredients are present.

(1) Note. This subclass includes "block" or "graft" copolymers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50, the (9) Note therein, for a discussion of the terms "two or more solid polymers or polymer-forming ingredients".