Hexahydro-1-hydroxy-9-hydroxymethyl-3-substituted-6H-dibenzo[b,d]pyrans as analgesic agents
Patent 4133819 Issued on January 9, 1979. Estimated Expiration Date: 
June 17, 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.
June 17, 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 References 3507885 3873576 InventorApplicationNo. 05/807439 filed on 06/17/1977US Classes:549/390, Dibenzo(b,d)pyrans (including hydrogenated)544/124, Six-membered ring consisting of one nitrogen and five carbons (e.g., pyridine, etc.)544/149, The additional hetero ring is six-membered546/194, Carbocyclic ring containing546/196, Hetero ring in the polycyclo ring system546/276.4, The additional hetero ring is five-membered consisting of one nitrogen and four carbons546/279.1, Nitrogen or -C(=X)-, wherein X is chalcogen, attached directly to the five- membered ring by nonionic bonding546/283.1, Chalcogen attached directly to the additional hetero ring by nonionic bonding548/525, Polycyclo ring system which includes ring chalcogen549/391Plural chalcogens bonded directly to the tricyclo ring systemExaminersPrimary: Chan, NickyAttorney, Agent or FirmInternational ClassesC07D 311/00 (20060101)C07D 311/80 (20060101) AbstractHexahydro-1-hydroxy-9-hydroxymethyl-3-substituted-6H-dibenzo[b,d]pyrans useful as analgesic agents, derivatives thereof, intermediates therefor and processes for their preparation.Other References
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