Precipitation process of 7-aminocephalosporanic acid (7-ACA)
Patent 6518420 Issued on February 11, 2003. Estimated Expiration Date: 
November 7, 2021. 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 7, 2021. 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 3367933 3507860 3507862 3575970 3594370 3594371 3813389 3840532 Process for the manufacture of aminoazetidinones Cephalosporin purification process InventorsAssigneeApplicationNo. 035638 filed on 11/07/2001US Classes:540/2197-amino cephalosporanic acid per se or salt thereof (i.e., 7-ACA or salt thereof)ExaminersPrimary: Berch, Mark L.Attorney, Agent or FirmForeign Patent References
International ClassC07D 501/26Foreign Application Priority Data1997-06-04 ATAbstractA process in the isolation of 7-aminocephalosporanic acid (7-ACA) from an alkaline, neutral or slightly acidic medium in the presence of an additive, e.g. selected from the group comprising organic carboxylic acid esters, polymeric glycols, polyacryls, amines and polyamines, melaminformaldehyde resins or amino acids and esters thereof to obtain 7-ACA agglomerates and or rosettes.Other References
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