Schott Glas

Schott Ag

Patrik Schober

Stefan Hubert

Evelin Weiss

Peter Nass

Rainer Liebald

Erich Rodek

Wolfram Beier

Dietmar Wennemann

Roland Schnabel

Helga Goetz

Horst Schillert

Ulrike Beer

Erhard Schwarz

Dietmar Schoenig

Hans-Hermann Leiss

Detlef Below

In the method according to the invention cold or unheated hardened glass and/or glass-ceramic parts are bonded together with a metallic ductile joining material, preferably silver, copper, aluminum or an alloy of those metals, to form a brittle article. The parts to be joined in an initial unheated state are placed with the metallic ductile joining material between them in a high frequency alternating field with frequencies preferably from 100 to 500 kHz. Then the joining material is inductively heated locally to melt it by means of the alternating field and the parts are pressed together to form a sufficiently strong bond between the parts.

Brittle article comprising joined-together hardened glass and/or glass-ceramic parts and method of making same

Modern cooking ranges have a glass-ceramic panel ( ) providing a cooking surface with at least one cooking zone, which typically is associated with a radiating heated body. To indicate the cooking zone and, if necessary, the residual heat, it is known to associate an externally lighted annular glass with the heated body, which is observable from above as a lighted ring. A structured lighted cooking zone indicating device is provided according to the present invention by a structured light-impermeable coating layer ( ) applied directly to the underside of the glass-ceramic panel ( ) having transparent regions forming a predetermined or desired structure or pattern within the cooking zone indicating device. This cooking zone indicating device is made by a screen printing technique in which a heat-resistant light-impermeable varnish is applied to the underside of the glass-ceramic panel to form the structured coating layer ( ).

Glass-ceramic panel providing a cooking surface with a cooking zone indicating device and method of making same

The wok is made from hardened glass or glass-ceramic material so that it has a cooking surface that is easier to clean than prior art metal woks. Furthermore when it is heated a better temperature distribution for cooking is produced and it can be universally heated, either by a radiantly heated body or an atmospheric gas burner. The method of making the wok starts with a glass blank or piece of borosilicate glass, which is heated until it softens and then is shaped or formed into the shape of the wok, optionally ceramicized and cooled.

Hardened glass or glass-ceramic cooking vessel formed as a wok, and method of making same

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Mainz-Ebersheim, Germany

Patrik Schober