Cephalosporin antibiotics
Patent 4267320 Issued on May 12, 1981. Estimated Expiration Date: 
July 27, 1999. 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 27, 1999. 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 3819601 3870713 3-Halo cephalosporins 7-Hydrocarbonoxy imino-acetamido-3-carbamoyloxy methylceph-3-em-4 carboxylic acids Patent #: 3974153 InventorsAssigneeApplicationNo. 06/061260 filed on 07/27/1979US Classes:540/222Additional hetero ring containingExaminersPrimary: Coughlan, Paul M. Jr.Attorney, Agent or FirmInternational ClassesC07B 57/00 (20060101)C07D 501/20 (20060101) C07D 501/60 (20060101) A61K 31/545 (20060101) C07D 501/30 (20060101) C07D 501/34 (20060101) C07D 501/04 (20060101) C07D 501/00 (20060101) Foreign Application Priority Data1976-02-16 GBAbstractThe invention provides novel antibiotic cefuroxime esters of the formula ##STR1## (wherein R1 is a primary or secondary alkyl group containing 1 to 4 carbon atoms and R2 is a primary or secondary alkyl group containing 1 to 6 carbon atoms provided that at least one of the groups R1 and R2 is methyl). These compounds are useful as orally administrable broad spectrum antibiotics. |
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