Leather tanning process
Patent 4999024 Issued on March 12, 1991. Estimated Expiration Date: 
July 9, 2010. 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.
July 9, 2010. 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 References1988685 InventorApplicationNo. 549541 filed on 07/09/1990US Classes:8/94.26, With organic material8/94.1R, TREATMENT OF HIDES, SKINS, FEATHERS AND ANIMAL TISSUES8/94.18, With organic material8/94.27Chromium compoundExaminersPrimary: Lieberman, PaulAssistant: McNally, John F. Attorney, Agent or FirmInternational ClassesC14C 003/02C14C 003/04 AbstractAn 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 containing a major proportion of a combination grease/oil lubricating solution, for process times and at process temperatures to impregnate skin pores with the lubricating solution. The thus-treated skins are bated and tanned, with a preferred process including a sequence of mineral and vegetable tanning steps. Subsequent to the tanning steps, the leather skins are tumbled in a bath containing a minor proportion of the lubricating solution and other lubricating agents. The resultant leather skins are soft and compliant and retain these characteristics despite washing in water. | |
