4. Synthetic resins or natural rubbers -- part of the class 520 ser
  5. Synthetic resins
  6. From ketone or ketene reactant

Kenneth N. Price

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Zwitterionic polyamines and process for their production

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From ketone or ketene reactant
Reexamination Certificate

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Zwitterionic polyetherpolyamines and process for their...

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate

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