US PATENT SUBCLASS 528 / 1
.~ FROM PLANT MATERIAL OF UNKNOWN CONSTITUTION

Current as of: June, 1999
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528 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
1.~ FROM PLANT MATERIAL OF UNKNOWN CONSTITUTION {2}
2  DF  .~.~> From cashew material with a sulfur-containing reactant
3  DF  .~.~> From cashew material with an aldehyde or derivative

DEFINITION

Classification: 528/1

(under subclass 1) Subject matter under Class 520, ... involving polymers derived from a plant-containing material of unknown constitution or processes of polymerizing; polymerizable compositions containing a plant material of unknown composition or processes of preparing.

(1) Note. The types of plant materials 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(s).

(2) Note. Types of materials included herein are nut shell liquors and essential oils. This subclass includes cashew nut shell liquor containing unseparated anacardic acid or Cardanol.

(3) Note. This subclass includes derivatives of plant materials which are undefinable as to chemical identity.

(4) Note. Materials which are substantially known as to chemical composition are excluded from this subclass or indents hereunder and are classified below in the schedule on the basis of the first specific reactant which is part of the chemical composition. If in any claim, any doubt exists as to whether a composition 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-referenced to the appropriate reactant subclass.

(5) Note. A chemical agent for purposes of this subclass is material which is added to solid polymer and causes or is present during a process wherein a chemical change of the solid polymer is effected. SEE OR SEARCH THIS CLASS, SUBCLASS:

86+, for Cardanol, anacardic acid or derivative, tannins, or tannic acid, cresylic acid, or coal tar extracts as reactants.