US PATENT SUBCLASS 521 / 81
.~.~.~ System contains a mixture of solid polymer or at least one solid polymer and at least one solid 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}
79  DF  .~.~ Extruding a solid polymer containing material to form a cellular product {2}
81.~.~.~ System contains a mixture of solid polymer or at least one solid polymer and at least one solid polymer-forming system

DEFINITION

Classification: 521/81

System contains a mixture of solid polymers or at least one solid polymer and at least one solid polymer-forming system:

(under subclass 79) Subject matter wherein a mixture of polymers or polymer-forming ingredients is employed during the extrusion step.

(1) Note. This subclass includes mixed resins, graft copolymer, or block copolymers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50, (9) Note therein, for a definition of the terms "mixture of polymers or polymer-forming ingredients".