Leather tanning process using aluminium (III) and titanium (IV) complexes
Patent 4731089 Issued on March 15, 1988. Estimated Expiration Date: 
October 16, 2005. 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.
October 16, 2005. 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 References 1941485 Method of tanning skins or hides Sodium alumoglucoheptonate, a process for its preparation and its use as sequestering agent Process for tanning hides Patent #: 4560384 InventorAssigneeApplicationNo. 06/788065 filed on 10/16/1985US Classes:8/94.29, With aluminum compound8/94.19R, Tanning8/94.21, Organic material8/94.26, With organic material8/94.27Chromium compoundExaminersPrimary: Lieberman, PaulAssistant: McNally, John F. Attorney, Agent or FirmInternational ClassesC14C 3/00 (20060101)C14C 3/04 (20060101) Foreign Application Priority Data1984-10-24 GBAbstractIn 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 formula:wherein M is an alkali metal, and n is 2 to 6. Especially preferred masking compounds are sodium gluconate and sodium glucoheptonate. The same process can be used for a wide range of skins, both as a base tannage and in combination with other tanning processes.Other References
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