Isoindoline pigments
Patent 4116959 Issued on September 26, 1978. Estimated Expiration Date: 
September 20, 1996. 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 20, 1996. 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 3923806 Iminoisoindoline pigments and processes for the preparation thereof Patent #: 3979386 InventorAssigneeApplicationNo. 05/724828 filed on 09/20/1976US Classes:544/284, Additional nitrogen containing unsaturated hetero ring (e.g., thiazole, etc.)524/87, Nitrogen ring directly fused or bridged to a ring system544/105, Bicyclo ring system having the oxazine ring as one of the cyclos (e.g., benzoxazines, etc.)544/237, Phthalazines (including hydrogenated)544/285, Chalcogen bonded directly at 2- and 4-positions544/287, Chalcogen bonded directly at 4-position544/289, Carbocyclic ring bonded directly at 2-position546/157, Chalcogen attached directly at 2-position by nonionic bonding548/305.1, The additional hetero ring is a cyclo in a polycyclo ring system (e.g., benzofuranyl-benzimidazole, etc.)548/306.4, Chalcogen bonded directly to ring carbon of the diazole ring548/471Nitrogen bonded directly to ring carbon of the five-membered hetero ringExaminersPrimary: Coughlan, Paul M. Jr.Attorney, Agent or FirmInternational ClassesC09B 57/00 (20060101)C09B 57/04 (20060101) Foreign Application Priority Data1975-09-26 CHAbstractIsoindoline pigment of the formula ##STR1## wherein R denotes a heterocyclic aromatic radical, X1 -X4 denote hydrogen or halogen atoms or one or two of the radicals X1 -X4 denote nitro, alkyl, alkoxy or phenoxy groups and the others denote hydrogen atoms which are useful for pigmenting high molecular organic material. |
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