U.S. federal trademark · Serial No. 74590661 · Reg. No. 2055851
mass transfer and heat exchange columns in which different fluid media come in contact with each other for the rectification, absorption, extraction, distillation, regeneration, wetting, cooling, drying of and the performance of chemical reactions involving the media, packings used in such columns, fillings for such columns, bases, fittings and fluid distributors used with such columns, and parts therefor
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