Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2005-05-31
2005-05-31
Morris, Patricia L. (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
active
06900333
ABSTRACT:
A process for the preparation of crystals of zonisamide containing residual 1,2-dichloroethane of not more than 5 ppm, by adding an aqueous C2-4alcohol to crystals of zonisamide containing residual 1,2-dichloroethane of more than 5 ppm, removing the 1,2-dichloroethane by azeotropic distillation, followed by collecting the precipitated crystals from the residual mixture.
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Kimura Yasujiro
Ueno Yoshikazu
Dainippon Pharmaceutical Co., Ltd.
Morris Patricia L.
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