Spinning pitch for carbon fibers and process for its production
Patent 5213677 Issued on May 25, 1993. Estimated Expiration Date: 
October 22, 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.
October 22, 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 ReferencesTreatment of pitches in carbon artifact manufacture Post-treatment of spinnable precursors from petroleum pitch Pitch for direct spinning into carbon fibers derived from a coal distillate feedstock Pitch for direct spinning into carbon fibers derived from a steam cracker tar feedstock Pitch for the production of carbon fibers Patent #: 4620919 InventorsAssigneeApplicationNo. 780344 filed on 10/22/1991US Classes:208/39, ASPHALTS, TARS, PITCHES AND RESINS; MAKING, TREATING AND RECOVERY208/22, Asphalts, tars, pitches and resins208/44, Chemical modification of asphalt, tar, pitch or resin208/45, Solvent extraction423/447.4Prior treatment before carbonization (except with gaseous oxygen)ExaminersPrimary: Morris, TheodoreAssistant: Hailey, P. L. Attorney, Agent or FirmInternational ClassesC10C 003/00C10C 003/08 Foreign Application Priority Data1990-10-22 JPAbstractSpinning pitch for carbon fibers, which (1) has a glass transition temperature width of at most 60° C. as measured by a differential scanning calorimeter, (2) contains at least 80% by volume an optically anisotropic phase, and (3) shows a shear viscosity of 200 poise at a temperature of from 270° to 370° C.Other References
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