Class C14C : CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
Subclass 3/24: Tanning; Compositions for tanning Chemical tanning by organic agents using lignin derivatives, e.g. sulfate liquor
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12129524 | Chrome-free tanning process of ecological leather | May 11, 22 | Oct 29, 24 | Sichuan University |
| 9970070 | Chrome-free leather retanning | Oct 15, 14 | May 15, 18 | Rohm and Haas Company |
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