4. Synthetic resins or natural rubbers -- part of the class 520 ser
  5. Synthetic resins
  6. From heterocyclic reactant containing as ring atoms oxygen,...

Yong-Ho Baek

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Method of preparing tetrahydrofuran

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

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Method of preparing tetrahydrofuran

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

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Process for producing poly-tetrahydrofuran

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Reexamination Certificate

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