C14CCHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHINGAPPARATUS THEREFORCOMPOSITIONS FOR TANNING bleaching of leather or furs D06L; dyeing of leather or furs D06PIn this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. C14C1/00 C14C1/00Chemical treatment prior to tanning C14C1/02Curing raw hides C14C1/04Soaking C14C1/06Facilitating unhairing, e.g. by painting, by liming C14C1/065Enzymatic unhairing C14C1/08DelimingBatingPicklingDegreasing C14C3/00TanningCompositions for tanning C14C3/02Chemical tanning C14C3/04Mineral tanning C14C3/06using chromium compounds C14C3/08by organic agents C14C3/10Vegetable tanning C14C3/12using purified or modified vegetable tanning agents C14C3/14Fat tanningOil tanning C14C3/16using aliphatic aldehydes C14C3/18using polycondensation products or precursors thereof C14C3/20sulfonated C14C3/22using polymerisation products C14C3/24using lignin derivatives, e.g. sulfate liquor C14C3/26using other organic substances, containing halogen C14C3/28Multi-step processes C14C3/30using physical means combined with chemical means C14C3/32Recovering tanning agents from leather C14C5/00Degreasing leather C14C7/00Pasting processes (chemical part) C14C9/00Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes C14C9/02using fatty or oily materials, e.g. fat liquoring C14C9/04Fixing tanning agents in the leather C14C11/00Surface finishing of leather C14C11/003using macromolecular compounds C14C11/006using polymeric products of isocyanates (or isothiocyanates) with compounds having active hydrogen C14C13/00Manufacture of special kinds or leather, e.g. vellum chamois tanning C14C3/14 C14C13/02Manufacture of technical leather C14C15/00Apparatus for chemical treatment or washing of hides, skins, or leather C14C99/00Subject matter not provided for in other groups of this subclass