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:
Dec. 12, 2006
Filed:
Dec. 22, 2003
Thomas J. Blong, Woodbury, MN (US);
Denis Duchesne, Woodbury, MN (US);
Gernot Loehr, Burgkirchen, DE;
Albert Killich, Burgkirchen, DE;
Tilman Zipplies, Burghausen, DE;
Ralph Kaulbach, Emmerting, DE;
Herbert Strasser, Burgkirchen, DE;
Thomas J. Blong, Woodbury, MN (US);
Denis Duchesne, Woodbury, MN (US);
Gernot Loehr, Burgkirchen, DE;
Albert Killich, Burgkirchen, DE;
Tilman Zipplies, Burghausen, DE;
Ralph Kaulbach, Emmerting, DE;
Herbert Strasser, Burgkirchen, DE;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
The invention relates to high purity fluoropolymers and processes for making such materials. These polymers are particularly suited for applications in the semiconductor industry. The process comprises removal of unstable polymer end groups by fluorination and removal of heavy metal impurities by extraction with an aqueous acid medium.