US PATENT SUBCLASS 562 / 403
.~.~ Hydrophenanthrene nucleus

Current as of: June, 1999
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562 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {41}
400  DF  .~ Carboxylic acids and salts thereof {14}
403.~.~ Hydrophenanthrene nucleus {1}
404  DF  .~.~.~> 1,4a-dimethyl hydrophenanthrene-1 carboxylic acids or salts thereof

DEFINITION

Classification: 562/403

Hydrophenanthrene nucleus:

(under subclass 400) Compounds which contain a hydrophenanthrene nucleus, not elsewhere provided.

(1) Note. Many of the patents found here are directed to compounds wherein the acid is obtained from a natural resin and has a known chemical structure as well as chemical modifications not provided for elsewhere.

(2) Note. The chemical treatment of a natural resin, followed by separation of a modified free natural resin acid of known chemical structure as a single chemical compound, is classified herein as is the product of such process.

(3) Note. This subclass contains, for example: [figure]

SEE OR SEARCH CLASS

530, Chemistry: Natural Resins or Derivatives; Peptides or Proteins; Lignins or Natural Reaction Products Thereof,

200+, for separation of free natural resin acid mixtures, or of free natural resin acid of indeterminate struction from the natural resin. 540, through 549, Organic Compounds, appropriate subclasses, for a free natural resin acid of known chemical structure which contains a heterocyclic group.

556, Organic Compounds,

1+, for heavy metal salts of free natural resin acids of known chemical structure.