Hexahydro-1-hydroxy-9-hydroxymethyl-3-substituted-6H-dibenzo[b,d]pyrans as analgesic agents
Patent 4209520 Issued on June 24, 1980. Estimated Expiration Date: 
October 18, 1998. 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.
October 18, 1998. 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 3901926 3927036 Dihydroxyhexahydrodibenzo[b,d]pyrans Patent #: 3968125 InventorApplicationNo. 05/952314 filed on 10/18/1978US Classes:514/337, The additional hetero ring is one of the cyclos in a polycyclo ring system514/454, Tricyclo ring system having the hetero ring as one of the cyclos544/124, 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 system546/282.7, Polycyclo ring system having the additional hetero ring as one of the cyclos548/525, Polycyclo ring system which includes ring chalcogen549/390, Dibenzo(b,d)pyrans (including hydrogenated)549/391Plural 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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