4. Synthetic resins or natural rubbers -- part of the class 520 ser
  5. Synthetic resins
  6. From phenol, phenol ether, or inorganic phenolate

William James Swatos

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Methods for the preparation of dianhydrides

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate

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Methods for the preparation poly(etherimide)s

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate

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