Method for liming skins and hides
Patent 4960428 Issued on October 2, 1990. Estimated Expiration Date: 
January 26, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 26, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod for preparing tannable pelts from animal skins and hides Soaking method Enzymatic method for hair recovery with concurrent opening of hide structure Soaking method Polymethyl methacrylate molding compounds Patent #: 4877853 InventorsApplicationNo. 303270 filed on 01/26/1989US Classes:8/94.18, With organic material8/94.1R, TREATMENT OF HIDES, SKINS, FEATHERS AND ANIMAL TISSUES8/94.15, Treatment of untanned skins or hides8/94.17Alkaline material removalExaminersPrimary: Lieberman, PaulAssistant: McNally, John F. Attorney, Agent or FirmInternational ClassC14C 001/04Foreign Application Priority Data1988-01-29 DEAbstractA process for liming skins and hides with preservation and separation of the hair, including the following successive steps:(A) a soaking step in a aqueous liquor containing a surfactant;(B) an incubation step in an aqueous liquor free of inorganic sulfur but containing hydrotropes and organic sulfur compounds as unhairing agents;(C) an step for immunization of the hair at a pH between 10 and 14;(D) a hair loosening step in which inorganic sulfide is added to the float;(E) a separation step in which the hair is separated from the skins and hides; and(F) a liming step in which the pelts so obtained are limed in an aqueous alkaline liquor comprising liming aids.Other References
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