US PATENT SUBCLASS 521 / 151
.~.~ Cellular polymer derived from tar, pitch, bitumen, asphalt, or plant material of unknown constitution, e.g., nut shell liquor, etc.

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}
151.~.~ Cellular polymer derived from tar, pitch, bitumen, asphalt, or plant material of unknown constitution, e.g., nut shell liquor, etc.

DEFINITION

Classification: 521/151

Cellular polymer derived from tar, pitch, bitumen, asphalt, or plant material of unknown constitution, e.g., nut shell liquor, etc.:

(under subclass 50) Subject matter involving a cellular polymer derived from at least one reactant which is identified as a tar, pitch, bitumen, asphalt, or as a plant material of substantially undefined chemical identity or process of preparing; compositions containing a polymer derived from a reactant identified as a tar, pitch, bitumen, asphalt, or as a plant material of substantially undefined chemical identity or contain a polymerizable reactant identified as tar, pitch, bitumen, asphalt, or plant material of substantially undefined chemical constitution and which composition is capable of preparing a cellular product or process of preparing same. Processes of treating a cellular polymer derived from at least one reactant which is identified as a tar, bitumen, asphalt, or as a plant material of substantially undefined chemical identity with a material which neither reacts with the cellular polymer to change or modify chemical bonds therein or neither forms a desired composition with the cellular polymer or products of such a

treatment; processes of treating a cellular polymer derived from at least one reactant which is identified as a tar, pitch, bitumen, asphalt, or as a plant material of substantially undefined chemical constituent without the addition of a material thereto whereby a physical or chemical change in the polymer may be effected or products which are the result of such a treatment.

(1) Note. Tars are the result of thermal decomposition of wood in the substantial absence of oxygen.

(2) Note. Asphalt or bitumen refers to solid or semi-solid materials which are often black or dark brown and which occur naturally or are obtained by refining petroleum or are the components of coal which are soluble in organic solvents. The terms also apply to residual materials such as coal, asphaltic, pyrobitumens, ozokerite, tar, pitch (e.g., asphalt, earth pitch, mineral pitch, petroleum asphalt, gilsonite, etc.).

(3) Note. The types of plant material which are proper for this subclass are those whose composition and constitution are not sufficiently determined to enable their classification in the later subclasses on the basis of a particular reactant.

(4) Note. Materials which are substantially known as to chemical constitution are excluded from this subclass and are classified below in the schedule on the basis of the first specific reactant which is part of the chemical composition. If any doubt exists as to whether a material is of sufficient chemical identity so as to be classified as a specific reactant then such doubt is to be resolved by classifying the claim as an original in this area and cross referencing to the appropriate reactant area.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53+, for a 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 foamed polymer to form a desired composition therewith, or for cellular products which are the result of such a treating process. 180, for Cardanol, anacardic acid or derivatives, tannins or tannic acid, or cresylic acid as reactants.