US PATENT SUBCLASS 8 / 94.25
.~.~ With heavy metal compound

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

94.1 R  DF  TREATMENT OF HIDES, SKINS, FEATHERS AND ANIMAL TISSUES {9}
94.19 R  DF  .~ Tanning {8}
94.25.~.~ With heavy metal compound {3}
94.26  DF  .~.~.~> With organic material
94.27  DF  .~.~.~> Chromium compound
94.28  DF  .~.~.~> Iron compound

DEFINITION

Classification: 8/94.25

(under subclass 94.19) Processes or tanning in which the tanning agent contains a compound of a heavy metal.

(1) Note. The term "heavy metal" as used here means a metal having a specific gravity greater than four.