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| Number | Title | Issue Date |
| 7226621 | Formulation and process for making formulation for preservation of animal and vegetable tissues A formulation and process for making a formulation for leather tanning using highly complexed Chrome III salts coupled with polymer complexing agents of medium and low molecular weight in the range of 500 to 10,000. Complexing polymers can contain vinylic acid/ester... | 06/05/2007 |
| 7118603 | Process 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 |
| 7063728 | Process for making chrome tanned leathers The present invention provides an improved pickling and bating free process suitable for both hides and skins for making chrome tanned leathers by using a mixture of conventional chrome tanning salt and alkali metal salt is used at a pH in the range of 5–5.5. ... | 06/20/2006 |
| 7029553 | Urea sulfate and urea hydrochloride in paper and pulp processing The present invention relates to the use of urea sulfate or urea hydrochloride, or both, in process streams in the paper and pulping industries to control pH, to bring about flocculation or precipitation of various materials, and to replace all or part of the sulfur... | 04/18/2006 |
| 7013838 | Bleached expanded pigskin and products Pigskin is processed to provide a bleached, expanded skin used in dog treat or chew products. The raw pigskin is dehaired and then daubed with an alkali mixture of an alkali liquid, alkali enzymes and lime, the mixture having a pH of greater than or equal to 12. The... | 03/21/2006 |
| 6957554 | Dehairing and fiber opening process for complete elimination of lime and sodium sulfide The use of lime and sodium sulfide in leather making creates a lot of environmental concern. However, there is no commercial beam house process that could totally eliminate the use of lime and sodium sulfide. In this invention, a novel bio-chemical process has been ... | 10/25/2005 |
| 6827745 | Mixture of THP and a moderator to tan leather A mixture of THP and a moderator is used to tan leather. The moderator is selected from metaphosphates and polyhydroxy or polypyrolidyl compounds such as glycerol, carboxydrates PVA or PVP. ... | 12/07/2004 |
| 6685747 | Mixture of THP and chrome as tanning agents THP and chrome are synergistic tanning agents. The combination of THP with small amounts of chrome and optionally non-ionic and/or cationic surfactants gives increased area yield and shrink temperature compared with THP, and reduced environmental impact c... | 02/03/2004 |
| 6395040 | Process 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 |
| 5985167 | Wet 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 |
| 5972037 | Leather tanning processes and the products thereof The production of household-machine washable and dryable, waterproof, nonflammable, and extremely colorfast leathers from wet blue hides by a process which has the advantage that significantly reduced volumes of toxic wastes are generated. The wet blue hi... | 10/26/1999 |
| 5900027 | Process 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 |
| 5885302 | Leather tanning process The present invention refers to a new process meant for chrome and/or vegetable leather tanning. The process proposed by the invention comprises the steps of bating or purging, conditioning, and chrome and/or vegetable tannage. The conditioning step uses ... | 03/23/1999 |
| 5868798 | Treatment 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 |
| 5820634 | Process for tanning leather Bisulphite-blocked, polyether-modified polyisocyanates are outstandingly suitable, in combination with mineral tanning agents, for the tanning of leather.... | 10/13/1998 |
| 5725599 | Process for mineral tanning, re-tanning or leather after-treatment A process for the production of mineral tanned or/and re-tanned or/and after-treated leather or pelt, wherein before the mineral tanning, directly after the mineral tanning, directly before the mineral re-tanning, after the mineral re-tanning or/and with ... | 03/10/1998 |
| 5602002 | Process for the production of low-chromium protein hydrolyzates Described is the chemical hydrolysis of partial hydrolysates obtained by the enzymatic decomposition, in aqueous conditions in the presence of alkaline-earth oxides or hydroxides, of protein-containing raw materials containing chromium. This enables prote... | 02/11/1997 |
| 5571443 | Synergistic combination of 2-(thiocyanomethylthio)benzothiazole and thiophanate compounds useful as fungicides A method for preventing the deterioration of leather by controlling the growth of fungus, wherein the leather is contacted with TCMTB and a thiophanate compound present in a combined amount synergistically effective to control the growth of at least one f... | 11/05/1996 |
| 5512058 | Process 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 |
| 5501708 | Process for tanning hides and compounds for use therein An organic polyol ester of a polycarboxylic acid having formulae (Para) and/or (Meta) and/or (Ortho), wherein R6 is --(COOR1)x, or (I)1 R7 is H; or R6 and R7 together for (II); R1 ... | 03/26/1996 |
| 5501709 | Economy 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 |
| 5480456 | Silica sols for obtaining a hide which is called a stabilized pickled or white or stabilized white Use of an aqueous silica sol for obtaining a stabilized pickled white or a stabilized white from a hide, in particular by treatment of a hide at a pH between 1 and 8, at ambient temperature, in an aqueous or brine bath with a density between 1.014 and 1.0... | 01/02/1996 |
| 5340365 | Process for producing chrome leather In the production of chrome leather, a pretreatment of delimed and bated pelts with condensation products not having a tanning action leads to substrates which, without any problems, can be mechanically dewatered and shaved or split and shaved. The proper... | 08/23/1994 |
| 5326377 | Method of treating hides There is described a method for treating delimed and bated hides, i.e. pelts. According to the inventive method, the pelts are brought to a suitable mineral tanning state and then tanned with mineral salts. The inventive treatment process corresponds to t... | 07/05/1994 |
| 5274078 | Process for producing collagen powder A collagen powder is obtained by wet-pulverizing a purified animal tissue consisting mainly of collagen in water at a collagen concentration of 1-30% by weight at a water temperature of not more than 37° C. and a pH value of 2-8, tanning treating the pul... | 12/28/1993 |
| 5271912 | Enzymatic processing of materials containing chromium and protein Chromium containing protein materials are treated by processes which include the steps of: combining the material to be treated with sufficient water to effect the solubilization of the gelable protein recovered therefrom, and an alkali additive. The mixt... | 12/21/1993 |
| 5269814 | Method of producing a split leather, especially for automotive applications subject to temperature and humidity fluctuations Between a chrome tanning step and a fat liquor treatment step, a flesh side split leather is subjected to shaving on both its split and flesh sides to a thickness of 1.1 to 2.5 mm, preferably 1.2 to 1.5 mm and is then aftertanned. After a split side dress... | 12/14/1993 |
| 5264000 | Aqueous solutions of synthetic tanning agents Aqueous solutions of synthetic tanning agents comprising (A) a lithium salt of a synthetic, anionic aromatic tanning agent or the anionic non-condensed precursor thereof, and, as optional components, (B) a water-soluble chromium, aluminum, iron or zirconium salt or... | 11/23/1993 |
| 5256318 | Leather treatment and process for treating leather A tanned leather treated with a fatliquoring agent in combination with a fluorine-containing oil, which has good touch, water resistance, water- and oil-repellency, washing resistance, and which is not discolored or faded by dry cleaning.... | 10/26/1993 |
| 5256317 | Compositions for the treatment of leather and furs A composition for the treatment of leather and furs, containing (A) an anionic aromatic syntan and (B) a polymer and/or copolymer of an unsaturated C3 -C5 mono- or dicarboxylic acid and/or hydroxy compounds thereof, a process for the... | 10/26/1993 |
| 5103521 | Leather treatment agent and its use Leather treatment agent containing a mixture a) of a carboxylic acid X--COOH I wherein X represents --[R--CO--Z--(R'--Z)a ]b --CO--R--COOH 1 or --R"--(Z--R')c --Z--CO--R--COOH ... | 04/14/1992 |
| 5098446 | Use of fluorochemicals in leather manufacture Leather manufacturing processes are described in which fluorochemicals are included in the various processing baths to improve efficiency, reduce processing time, and increase the quality of the finished leather product. Various types of fluorochemicals a... | 03/24/1992 |
| 5094946 | Enzymatic processing of materials containing chromium and protein Materials containing both chromium and protein and treated by processes which include the steps of: combining a material to be treated (i.e. containing both chromium and protein) with sufficient water to produce a mixture having from about 75 wt. % water ... | 03/10/1992 |
| 4999024 | Leather tanning process An improved leather tanning process is provided for producing leather which can be washed in water substantially without drying or cracking. The tanning process includes preliminary treatment steps during which skins are tumbled in a heated bath containin... | 03/12/1991 |
| 4978361 | Economy chrome tanning Process for economy chrome tanning, which comprises pretreating the pelt prior to tanning with 0.5 to 2% by weight, preferably 0.7 to 1,2% by weight, of an aldehyde- or keto-carboxylic acid, tanning in a conventional manner and then finish-tanning with 2 ... | 12/18/1990 |
| 4963156 | Tanning agent and process A leather tanning agent for use as a sole tannage or with another includes Al (III) ions, Ti (IV) ions and an organic masking agent in specific proportions. The ratio of Ti:Al expressed as metal oxides TiO2 :Al2 O3 on a we... | 10/16/1990 |
| 4961750 | Acrylate tanning agent Tanning agents containing a complex formed between chromium ions and an acrylate or methacrylate polymer and further including an organically bound thio group present in said polymer or in a mercapto compound added to the tanning agents, and methods for p... | 10/09/1990 |
| 4938779 | Chrome tanning of leather with reduced waste of chromium The efficiency of chromium utilization in chrome tanning of hides to make leather is greatly improved by performing the preliminary neutralization of the acid tanning liquor in the presence of an aldehydo or keto acid, before conventional subsequent neutr... | 07/03/1990 |
| 4937009 | Leather tanning process using aluminium (III) and titanium (IV) complexes In a leather tanning process, animal skins are treated with a tanning agent comprising an aluminium (III)/titanium (IV) mixed complex with a salt of a polyhydroxymonocarboxylic acid as a masking compound. The masking compound preferably has the general fo... | 06/26/1990 |
| 4919680 | High-extraction chrome tanning process Crome tanning of pickled animal hides with a tanning agent comprising a reaction product of a basic chromium (III) sulfate and aliphatic C4 -C6 dicarboxylic acids or their salts is improved by preparing the reaction product in an aqu... | 04/24/1990 |
