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:
Apr. 08, 1980
Filed:
Jan. 06, 1978
Applicant:
Inventors:
Gunter Freitag, Frankfurt am Main-Hochst, DE;
Alfred Krahl, Eschborn II, DE;
Gerhard Ullmann, Gross-Gerau, DE;
Gunter Wenzel, Kelkheim, DE;
Assignee:
Sigri Elektrographit GmbH, Meitingen bei Augsburg, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B29D / ;
U.S. Cl.
CPC ...
156154 ; 156272 ; 156282 ; 156296 ; 156304 ; 156311 ; 156333 ; 1563066 ; 1563082 ;
Abstract
Method and apparatus for joining together edge surfaces of polytetrafluoroethylene material by a butt joint in which clamps along the abutting surfaces press together the abutting surfaces, heating means spaced from and out of direct contact with a strip between the clamps heats the strip by radiation or convection, and a cooling arrangement is provided via the clamps to remove heat from the clamping zone. A thin foil of a fluorine-containing thermoplastic inserted between the abutting surfaces facilitates joining of the surfaces.