with formation of cyclic imides of ortho- or peri- dicarboxylic acids

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    • Bayer Aktiengesellschaft
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    3356672

    • Patent number 3,356,672
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    • C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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    3211554

    • Patent number 3,211,554
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    2288422

    • Patent number 2,288,422
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