US PATENT SUBCLASS 8 / 433
.~.~.~ Swelling of hair

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

404  DF  DYEING INVOLVING ANIMAL-DERIVED NATURAL FIBER MATERIAL (OTHER THAN SOLELY WOOL OR SILK), E.G., LEATHER, FUR, HAIR, FEATHERS, ETC., COMPOSITION, PROCESS, OR PRODUCT {2}
405  DF  .~ Hair dyeing {7}
431  DF  .~.~ With fluid treatment, e.g., bleaching with dyeing, etc. {2}
433.~.~.~ Swelling of hair

DEFINITION

Classification: 8/433

Swelling of hair:

(under subclass 431) Subject matter involving swelling of the hair.

(1) Note. -S-S- bond disruptors swell hair but go in subclass 432 above.

(2) Note. Normally alkali or LiBr will swell hair. The latter is known as a lyotropic agent.

(3) Note. A urea or thiourea-type material is often used.