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:
Nov. 04, 1997
Filed:
Mar. 25, 1996
Applicant:
Inventor:
James Lang Webster, Parkersburg, WV (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
570150 ;
Abstract
Tetrafluoroethylene is obtained by subjecting metal fluoride, such as sodium fluoride, calcium fluoride or silicon fluoride, to a plasma to form a gaseous mixture of metal and reactive fluorine. This gaseous mixture is then reacted with a bed of carbon particles at a temperature at which the metal, when non-carbonaceous, does not condense. The resultant reaction mixture is then quenched to obtain the tetrafluoroethylene. Typically, the plasma will be at a temperature of at least 4500.degree. C. and the temperature of the carbon bed will be in the range of 2000.degree. C. to 3500.degree. C.