Piperazine compounds which are substituted
Patent 5322943 Issued on June 21, 1994. Estimated Expiration Date: 
August 26, 2011. 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.
August 26, 2011. 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 ReferencesNovel crystalline forms of prazosin hydrochloride Patent #: 4092315 InventorsAssigneeApplicationNo. 749829 filed on 08/26/1991US Classes:544/360, Six-membered ring consisting of one nitrogen and five carbons (e.g., pyridine, etc.)544/364, At least three hetero rings containing544/366, Five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen544/372, Five-membered hetero ring consisting of one nitrogen and four carbons544/376Bicyclo ring system having the additional hetero ring as one of the cyclosExaminersPrimary: Ivy, Warren C.Assistant: Davis, Zinna Northington Attorney, Agent or FirmInternational ClassC07D 213/02AbstractDisclosed are Ɗ9(11) -steroids (VI) and amino substituted steroids (XI) which contain an amino group attached to the terminal carbon atom of the C17 -side chain, more particularly amino steroids (Ia and Ib), aromatic steroids (II), Ɗ16 -steroids (IIIa and IIIb), reduced A-ring steroids (IV), Ɗ17(20) -steroids (Va and Vb) and Ɗ9(11) -steroids (VI) which are useful as pharmaceutical agents for treating a number of conditions.Field of SearchSix-membered ring consisting of one nitrogen and five carbons (e.g., pyridine, etc.)At least three hetero rings containing Five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen Five-membered hetero ring consisting of one nitrogen and four carbons Bicyclo ring system having the additional hetero ring as one of the cyclos The additional hetero ring is five-membered and unsaturated (e.g., thienyl piperazines, etc.) |
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