US PATENT SUBCLASS 560 / 68
.~.~.~.~.~.~ Tannins and reaction products thereof

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {17}
1  DF  .~ Carboxylic acid esters {14}
8  DF  .~.~ Aromatic acid moiety {9}
55  DF  .~.~.~ Oxy in acid moiety {7}
64  DF  .~.~.~.~ Ester function attached directly to a ring {5}
67  DF  .~.~.~.~.~ Phenolic hydroxy or metallate {4}
68.~.~.~.~.~.~ Tannins and reaction products thereof {1}
69  DF  .~.~.~.~.~.~.~> Extraction from bark or vegetable material

DEFINITION

Classification: 560/68

Tannins and reaction products thereof:

(under subclass 67) Products and their processes which are known as tannins or tannic acids. Chemically they appear to be esters of gallic acid in which the carboxyl group thereof is esterified by the hydroxyl group of a second molecule of gallic acid, or glucosides thereof.

(1) Note. This subclass includes, for example, tannin extracts together with their preparation, treatment and purification. Many of these extracts are useful as tanning or mordanting agents. Where the tannin extract is admixed with other ingredients to form a composition having an art use provided for elsewhere, the patent is placed in the other class and cross referenced to this class when desirable. For example, tanning compositions and mordanting compositions are in Class 8, Bleaching and Dyeing: Fluid Treatment and Chemical Modification of Textiles and Fibers.