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:
Aug. 22, 2000
Filed:
Nov. 19, 1997
Applicant:
Inventor:
Charles John Shields, Stockton Heath, GB;
Assignee:
Imperial Chemical Industries PLC, London, GB;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
570179 ;
Abstract
A process for the removal of 1,1,2,2-tetrafluoroethane from 1,1,1,2-tetrafluoroethane which comprises contacting 1,1,1,2-tetrafluoroethane containing 1,1,2,2-tetrafluoroethane with a zeolite having a mean pore size in the range of 3.8 .ANG. an 4.8 .ANG.. The zeolite is preferably calcium chabazite.