US PATENT SUBCLASS 521 / 63
.~.~.~ Cellular product-forming process wherein the removable material is present or is produced in situ during the solid polymer formation step

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}
61  DF  .~.~ Process of preparing a cellular product by removal of material from a solid polymer-containing matrix without expanding the matrix; composition which is nonexpandible and is designed to form a cellular product by said process; or process of preparing said composition {3}
63.~.~.~ Cellular product-forming process wherein the removable material is present or is produced in situ during the solid polymer formation step

DEFINITION

Classification: 521/63

Cellular product-forming process wherein the removable material is present or is produced in situ during the solid polymer formation step:

(under subclass 61) Subject matter wherein the material removed to form the cellular structure is present during the solid polymer formation or is formed during the polymer-forming process.