Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2005-03-08
2005-03-08
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C526S065000, C528S271000, C528S272000, C528S274000, C528S483000
Reexamination Certificate
active
06864345
ABSTRACT:
In a process of producing polyethylene terephthalate by esterification of terephthalic acid with ethylene glycol and polycondensation, the vapors formed are rectified, the liquid phase is recirculated to the process, and the lower-boiling components are condensed. To obtain an almost completely stripped condensate, condensate is circulated and stripped the same with air, and the exhaust air is subjected to a catalytic oxidation.
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John Brown Deutsche Engineering, PET Resin Technology and Products, South Asia, Polyester & PET 96, Nov. 20 and 21, 1996, Mumbai, Indai.
Boykin Terressa
Norris McLaughlin & Marcus PA
Zimmer AG
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