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

F. C. Dupre

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Cyclic urea-formaldehyde prepolymer for use in phenol-formaldehy

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

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Cyclic urea-formaldehyde prepolymer for use in...

Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Reexamination Certificate

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Cyclic urea-formaldehyde prepolymer for use in...

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

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