Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2007-09-11
2007-09-11
Seaman, D. Margaret (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
active
11078022
ABSTRACT:
This invention is related to a method for making diether dianhydrides by the reaction of halophthalic anhydride and a metal salt of an aromatic dihydroxy compound in the presence of a solvent and a phase transfer catalyst. Typical phase transfer catalyst include guanidium salts, aminopyridinium salts, or phosphazenium salts.
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Brunelle Daniel Joseph
Cella James Anthony
Chan Kwok Pong
Ye Qing
Caruso Andrew J.
Chandrakumar Nizal S.
General Electric Company
Powell, III William E.
Seaman D. Margaret
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