Nitration of phthalic acid and phthalic anhydride using nitric acid
Patent 5155234 Issued on October 13, 1992. Estimated Expiration Date: 
May 13, 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.
May 13, 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 ReferencesProcess for making dinitrotoluene Method for making N-substituted nitrophthalimides Nitration reactions with acid anhydride promoters Patent #: 4921970 InventorApplicationNo. 700934 filed on 05/13/1991US Classes:549/243, Nitrogen or additional chalcogen bonded directly to the bicyclo ring system562/434, Nitro or nitroso562/856, Processes562/887Carboxylic acid anhydrides (i.e., compounds having the -C(=O)-O-C(=O)- group)ExaminersPrimary: Shippen, Michael L.Attorney, Agent or FirmInternational ClassC07D 307/77AbstractA process for the preparation of nitrophthalic acid by the nitration of phthalic acid and/or phthalic anhydride using only nitric acid, said nitric acid having a concentration of at least about 95% by weight, and then recovering the nitrophthalic acid formed from the nitric acid solution.Other References
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