Cyanocarboxamidines and quinazoline process
Patent 4138561 Issued on February 6, 1979. Estimated Expiration Date: 
September 30, 1997. 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.
September 30, 1997. 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 ReferencesProcess for hypotensive 4-amino-2-(piperazin-1-yl) quinazoline derivatives Patent #: 3935213 InventorsAssigneeApplicationNo. 05/838417 filed on 09/30/1977US Classes:544/284, Additional nitrogen containing unsaturated hetero ring (e.g., thiazole, etc.)540/575, The nitrogens are in the 1,4-positions of the hetero ring544/291, Nitrogen bonded directly at 2- and 4-positions544/367, Ring chalcogen in the five-membered hetero ring544/3691,3-oxazole ring or 1,3-thiazole ring (including hydrogenated)ExaminersPrimary: Coughlan, Paul M. Jr.Attorney, Agent or FirmInternational ClassesC07D 239/00 (20060101)C07D 295/215 (20060101) C07D 307/00 (20060101) C07D 295/21 (20060101) C07D 239/95 (20060101) C07D 307/68 (20060101) C07D 271/00 (20060101) C07D 271/113 (20060101) C07D 295/00 (20060101) AbstractNovel cyanocarboxamidines are disclosed. The new cyanocarboxamidines are particularly valuable as intermediates in the preparation of antihypertensive 4-amino-2-(4-substituted-piperazin-1-yl)-quinazolines.Other References
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