US PATENT SUBCLASS 521 / 189
.~.~ Cellular product derived from reactant containing a carbon to chalcogen bond

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}
189.~.~ Cellular product derived from reactant containing a carbon to chalcogen bond

DEFINITION

Classification: 521/189

Cellular product derived from reactant containing a carbon to chalcogen bond:

(under subclass 50) Subject matter involving a cellular polymer derived from at least one reactant having chalcogen (i.e., oxygen, sulphur, selenium, or tellurium) bonded directly to carbon or processes of preparing a composition containing a polymer derived from such a reactant or involving a polymerizable reactant having chalcogen bonded directly to carbon and which composition is capable of forming a cellular product or process of preparing same;

processes of treating a cellular polymer derived from such a reactant with a material which neither reacts with the cellular polymer to change or modify chemical bonds therein nor forms a desired composition with the cellular polymer or products thereof; processes of treating a cellular polymer without the addition of a material whereby a physical or chemical change in the polymer may be effected or products which are the result of such a treatment.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53+, for process of treating a cellular polymer with a material so as to modify or change chemical bonds in the cellular polymer or wherein a material is added to a cellular polymer to form a desired composition therewith; of for cellular products which are the result of such a treating operation.

CROSS-REFERENCE ART COLLECTIONS

The following subclasses are collections of published disclosures pertaining to various aspects of art relating to cellular polymers which do not form an appropriate base for subclass classification in the classification schedule.

(1) Note. Disclosures have been placed for value as a search aid and in no instance do they represent the entire extent of the prior art.