Process for the production of gelatin from fish skins
Patent 5093474 Issued on March 3, 1992. Estimated Expiration Date: 
April 12, 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.
April 12, 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 References2024683 InventorsAssigneeApplicationNo. 338595 filed on 04/12/1989US Classes:530/355, Separation, purification or synthesis426/576, Gelatin or derivatives530/354, Gelatin530/857Fish; fish eggs; shell fish; crustaceaExaminersPrimary: Schain, Howard E.Assistant: Koh, Choon P. Attorney, Agent or FirmForeign Patent References
International ClassesC07K 003/02C09H 003/00 C09H 003/02 Foreign Application Priority Data1988-08-04 ILAbstractA process for the production of gelatin from fish skins comprises the steps of: (a) cleaning the skins in order to remove therefrom substantially all superfluous material; (b) treating with dilute aqueous alkali; (c) washing with water until the washing water is substantially neutral; (d) treating with dilute aqueous mineral acid; (e) washing with water until the washing water is substantially neutral; (f) treating with dilute aqueous citric acid and/or another suitable organic acid; (g) washing with water until the washing water is substantially neutral; and (h) extracting with water at elevated temperatures not above about 55° c., the washed citric acid-treated skins. In practice, the present process employs much lower temperatures than known heretofore for the treatment steps, which results in a high quality product (e.g. absence of a fishy smell), compared with the prior art.Other References
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