4. Synthetic resins or natural rubbers -- part of the class 520 ser
  5. Synthetic resins
  6. Mixing of two or more solid polymers; mixing of solid...

Leonard J. Calbo

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Aromatic sulfonic acid oxa-azacyclopentane adducts

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
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Curing amino resins with aromatic sulfonic acid oxa-azacyclopent

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
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Latent catalysts

Stock material or miscellaneous articles – Composite – Of aldehyde or ketone condensation product
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