US PATENT SUBCLASS 8 / 439
.~ Logwood

Current as of: June, 1999
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8 /   HD   BLEACHING AND DYEING; FLUID TREATMENT AND CHEMICAL MODIFICATION OF TEXTILES AND FIBERS

438  DF  PROCESS OF EXTRACTING OR PURIFYING OF NATURAL DYE {1}
439.~ Logwood

DEFINITION

Classification: 8/439

Logwood:

(under subclass 438) Subject matter containing logwood type dyes.

(1) Note. Included herein is the aqueous extraction of heartwood, i.e., of hematoxyon campechium and oxidation in air to yield hematein.