The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 2001
Filed:
May. 25, 1994
Applicant:
Inventors:
Atsuo Nishimura, Kanagawa, JP;
Reiji Takahashi, Kanagawa, JP;
Assignee:
Showa Denko K.K., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/34 ;
U.S. Cl.
CPC ...
B01D 3/34 ;
Abstract
A purification process of pentafluoroethane from a crude pentafluoroethane containing chloropentafluoroethane as a by-product by extractive distillation using an extracting reagent having a standard boiling point of from −10° C. to 100° C. and being selected from paraffinic hydrocarbons, alcohols, ethers, esters, and ketones.