Process for preparing animal hides or pelts
Patent 5900027 Issued on May 4, 1999. Estimated Expiration Date: 
November 19, 2017. 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.
November 19, 2017. 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 of treating hides Process for the treatment of skins, hides or shett materials containing collagen by a dense, pressurized fluid Patent #: 5512058 InventorsApplicationNo. 894962 filed on 11/19/1997US Classes:8/94.19R, Tanning8/94.15, Treatment of untanned skins or hides8/94.18, With organic material8/94.2, With subsequent treatment8/94.21, Organic material8/94.24, With aldehyde-aromatic condensation product8/94.25, With heavy metal compound8/94.27, Chromium compound8/94.32, With vegetable extract8/94.33With organic materialExaminersPrimary: Diamond, AlanAttorney, Agent or FirmForeign Patent References
International ClassesC14C 001/04C14C 003/00 C14C 009/02 Foreign Application Priority Data1995-03-03 DEAbstractIn 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 tanning solution in which carbon dioxide has been dissolved under pressure. This makes it possible to reduce considerably the period of time usually required for the production of leather or pelts, since the treatment period is reduced markedly. Furthermore, it is possible in this way to combine conventional treatment steps and to conduct them in only one single treatment step. Instead of the 20 to 40 t of waste water per tonne of leather or pelt which are customary with conventional processes, only about 2 t of waste water per tonne of leather or pelt are now produced. Besides having a sharply reduced environmental impact, the proposed process is also significantly more economical than conventional processes, owing to the considerably shorter overall processing time.Other References
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