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Class 8/94.15 - Treatment of untanned skins or hides


Subclass of Class 8 - Bleaching and dyeing; fluid treatment and chemical modification of textiles and fibers
Definition: Processes directed to the treatment of untanned skins or
No. of patents: 80
Last issue date: 08/23/2011


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NumberTitleIssue Date
8002846Method for manufacturing protein filling agent for leather utilizing animal hairs
Method for manufacturing a protein filling agent for leather utilizing animal hairs. The method includes pre-treating the animal hairs to obtain pre-treated animal hairs, wherein the pre-treating comprises soaking the animal hairs in an inorganic acid solution and a...
08/23/2011
7753964Method for producing a leather semi-finished product
A semifinished leather product is produced from an animal hide by pretanning with the use of a chromium-free tanning agent and of a clay mineral which, after stirring for 30 minutes in water at 50° C. at a circumferential rotor speed of from 5 to 25 m/s, has a numb...
07/13/2010
7527652Dithiol compositions and methods of treating animal hides using the same
Mixtures of (A) from 55 to 65 mol % of erythro-dithiol of formula erythro-IV: and (B) from 35 to 45 mol % of threo-dithiol of formula threo-IV or threo-IV′:
05/05/2009
7404826Method for removing horn substance from skins, pelts or furs
Horny substances are removed from hides, pelts or skins of dead animals by treating the hides, pelts or skins in aqueous liquor with one or more compounds of the formula I or their corresponding alkali metal or alkaline ear...
07/29/2008
7300599Lubricant for the production and treatment of leather
Fatliquoring agents for the production and/or for the treatment of leather comprising (A) at least one natural lipoid; (B) at least one polymer based on the monomers acrylic acid and/or methacrylic acid; (C) an emulsifier compo...
11/27/2007
7270985Process for the preparation of aldehyde from a proteinous source for industrial applications
A process is disclosed to treat the protein hydrolysate, prepared conventionally from a proteinous source, with alkali metal hydride to obtain alcohol which is subsequently oxidized to obtain aldehyde under certain specified conditions, thereby converting large prot...
09/18/2007
7252687Process for making wet-pink leather
A process of combination tannage is disclosed whereby Zirconium salt is complexed with THP salt to produce wet pink leather without using any conventional dye. The resulting leathers exhibit a shrinkage temperature of more than 100° C., and other properties compara...
08/07/2007
7250062Method for removing horn substances from animal skin
The invention relates to a method for removing horn substances from animal skin. The method is characterized in that animal skins are treated in an aqueous bath containing between 0.05 and 5 wt. %, in relation to the weight of the salt, of at least one compound of g...
07/31/2007
7237293Method of controlling a shoe washing process of a washing machine
A method of controlling a shoe washing process of a washing machine performs washing, rinsing, and spin-drying operations. The method includes the operations of determining whether or not to select a shoe washing course, and washing the shoe according to a reversibl...
07/03/2007
7198647Process for lime and sulfide free unhairing of skins or hides using animal and/or plant enzymes
The present invention relates to a process for lime- and sulfide-free unhairing of skins/hides using animal and/or herbal (plant) enzymes. The process comprises presoaking the skins or hides in water for 2–6 hours, pasting an enzyme solution of animal or plant ori...
04/03/2007
7192534Low-VOC stuffing agents, the use thereof in the production and/or treatment of leather and skins and corresponding production or treatment method
Agents for the fatliquoring of, in particular, leathers and hides tanned in the absence of chromium comprise A) at least one modified natural oil and B) at least one stabilizer LnR
03/20/2007
7118603Process for the preparation of a formaldehyde-free synthetic tanning agent
A process for the preparation of a synthetic tanning agent is disclosed whereby multi functional polymer is polymerized with sulfonated aromatic compound, pretreated with organic ligand to form an organo-polymeric matrix, which is essentially formaldehyde-free. The ...
10/10/2006
7115387Process for the preparation of aldehyde from a proteinous source for industrial applications
A process is disclosed to treat the protein hydrolysate, prepared conventionally from a proteinous source, with alkyl halide to obtain alcohol which is subsequently oxidized to obtain aldehyde under certain specified conditions, thereby converting large protein mole...
10/03/2006
6964745Use of superabsorbent polymers for treating raw skins, corresponding compositions and methods and resulting treated skins
The invention relates to use of superabsorbent (co)polymers (SAP) as an agent for preservation treatment of animal hides. The SAP is used preferably in conjunction with salt or other hygroscopic agent, in particular 50% NaCl/50% SAP by weight. Suitably treated hides...
11/15/2005
6942961Method for dehydrating biological tissue for producing preserved transplants
The invention relates to a two-step method for dehydrating biological tissues for producing preserved transplants. In a first step, the tissue is partially dehydrated with an organic, water-miscible solvent. In a second step, the tissue is dehydrated further by free...
09/13/2005
6855171Process for waterproofing leather and leather obtained by means of said process
A process for waterproofing leather (1) includes pressing on the internal surface of the leather (1) at least one semi-permeable membrane (2) whose surface contacting the leather (1) is provided with a glue pattern. The glue pattern of th...
02/15/2005
6849095Agent and method for enzymatically tanning skins
Described are a composition and process for the enzymatic tanning of hides utilizing one or more transglutaminases for crosslinking the collagen in the hide. ...
02/01/2005
6811572Plush leather-like sheet product and method for production thereof
The present invention relates to a suede-like sheet which is characterized in that, in a suede-like sheet comprising primarily ultrafine fiber of no more than 0.3 dtex and polyurethane, said polyurethane employs polymer diol containing 30 wt % to 90 wt % polycarbona...
11/02/2004
6689172Auxiliary for liming and loosening hairs of animal skins
The invention concerns an auxiliary for liming and loosening hairs of animal skins, containing, in aqueous solution: 10 to 50 wt. % of a polysaccharide solution; 5 to 25 wt. % of a mercapto-carboxylic acid or one of its salts; and 1 to 10 wt. % of a merca...
02/10/2004
6663676Preparation of an aqueous composition for treating leather
A method of preparing an aqueous composition for treating leather comprises adding a predetermined amount of a solid particulate leather treatment composition directly into a predetermined amount of water in a vessel at a tannery; and dissolving or disper...
12/16/2003
6589293Depilatory paint thickener comprising an anylopectin starch
The invention relates to the dehairing (depilating) of animal pelts, hides or skins, more specifically to depilatory paint and depilatory paint (depilation paint) thickener used in the depilation process in for example fellmongeries. The invention provide...
07/08/2003
6540790Tanning leather
Leather is tanned by cross-linking collagen with tris(hydroxymethyl)phosphine or a condensate of a tetrakis(hydroxymethyl)phosphonium salt with an amide or amine in a main tannage or retannage....
04/01/2003
6482240Method of making a collagen membrane from porcine skin
Collagen membranes are formed from porcine rinds (i.e., pig skins) for us in a variety of applications and, most preferably, for wrapping food products, such as hams and the like. First, after removing skins from the porcine, the skins are promptly frozen...
11/19/2002
6451062Hide-curing additive
The invention relates to an improved hide-curing additive comprising an effective biocidal amount of an essential oil and a non-ionic surfactant. The improved additive provides an effective cure for the hides, is environmentally safe and economical....
09/17/2002
6395040Process for producing leather
A method for producing leather generally including the steps of: (a) providing wet blue, full grain skins, (b) applying a liquid chrome solution to the skins while at a pH of 3.5 or lower, (c) raising the pH level of the skins to at least approximately 6....
05/28/2002
6387135Treatment of hides
A process and apparatus for the treatment of hides and skins (3). The hide or skin is placed on a support (1, 2) and sealed to the support around the edges of the skin or hide. A treatment liquor is then supplied under pressure between the skin or hide an...
05/14/2002
6322717Method of processing leather material, leather material thus processed and leather product using leather material thus process
A processing method of a leather material having grains thereon is disclosed. The processing method of the leather material includes: the first step of sammying a tanned leather material by hand; the second step of moistening the leather material; and thi...
11/27/2001
6251414Aqueous formulation for pretanning raw hides
There is disclosed an aqueous formulation for pretanning leather, which formulation comprises (a) a reductive saccharide having a dextrose equivalent of 10 to 100, and (b) an aliphatic dialdehyde containing 2 to 8 carbon atoms, and which is devoid of mineral s...
06/26/2001
5985167Wet treatment of leather hides
Wet leather treating compositions and methods of wet treating leather hides employing alkylpolyglycosides for enhancing the penetration and absorption of the leather treatment formulations in an environmentally safe manner. The compositions are substantia...
11/16/1999
5931970Process for treating leathers with surfactants to improve water repellency
The present invention relates to a process for improving the waterproofing of hides, skins, leathers, and furs, as well as other fibrous materials, by treatment with special surfactants in the beamhouse and/or in the treatment of the wet blues, prior to w...
08/03/1999
5900027Process for preparing animal hides or pelts
In order to make processes for finishing animal hides or pelts less labor-intensive and more environmentally compatible, a process is proposed in which, following a conventionally conducted soak, the animal hides or pelts are treated with a conventional t...
05/04/1999
5868798Treatment of hides
A process and apparatus for treating animal skins or hides (10) comprises stretching the hide to extend it and to open the structures and mounting the hide in a frame (15) by ties (12) extending between the hide edge attachments (11) and the frame. The hi...
02/09/1999
5733340Aqueous composition for the pretanning of hide pelts or retanning of leather
An aqueous composition for the pretanning of hide pelts or for the retanning of leather comprises (A) an aliphatic dialdehyde containing 2 to 8 carbon atoms, (B) an anionic aromatic tanning agent, (C) water and, if desired, (D) an acid. The leather tanned...
03/31/1998
5728313Leather oiling compositions and their use
A method for oiling leather and skins by impregnating the leather and skins with partial esters of cyclic polycarboxylic acids or (partial) anhydrides with monofunctional fatty alcohols and optionally fixing the partial esters in the leather. Aqueous disp...
03/17/1998
5720778Method of producing high-molecular products from collagen-containing materials, and product produced by the same
A method of producing a collagen-containing material has the steps of comminuting untanned collagen-containing raw material, preparing from the raw material a collagen solution, preparing a leather paste from tanned collagen-containing waste, mixing the c...
02/24/1998
5710040Stable enzymatic aqueous liquid composition for the production of leather
An aqueous liquid composition containing one or more enzymatic active substances and at least 10 wt % to a maximum of (100-x) wt % molasses, wherein x is the fraction of enzymatic active substances in wt % and wherein x is a value from 0.001 to 90, which ...
01/20/1998
5683611Preparations for the oiling of leather
Aqueous dispersions containing special aminopropionic acid derivatives and co-oligomers based on fatty crotonates are suitable for the oiling of leather. The leathers thus treated are distinguished by high resistance to washing and cleaning and by imperme...
11/04/1997
5567205Wet treatment of leather hides
Wet leather treating compositions and methods of wet treating leather hides employing alkylpolyglycosides for enhancing the penetration and absorption of the leather treatment formulations in an environmentally safe manner. The compositions are substantia...
10/22/1996
5512058Process for the treatment of skins, hides or shett materials containing collagen by a dense, pressurized fluid
A process for the treatment of products constituted by hides and skins with a view towards their transformation into leather, and for the treatment of leather which involves contacting the product with a dense, pressurized fluid, such as CO2, i...
04/30/1996
5501709Economy and plumping chrome tanning
The present invention relates to a process for economy and plumping chrome tanning by admixing the pelts in the pickle bath with an aldehyde- and/or keto-carboxylic acid and then tanning, which comprises, prior to the addition of the aldehyde- and/or keto...
03/26/1996
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