Abstract: Bending and tempering of a glass sheet is achieved in that the glass sheet is submitted to the tempering phase while still being placed, as in the forming phase, on a forming ring integral with a frame which holds the latter, in order to maintain the previously formed shape unaltered. Vertical upward and downward movement is achieved both in the forming zone and in the glass sheet discharge zone by means of a rotating coupling device which supports the frame with forming ring and the glass sheet placed thereupon. Means are provided for conveying the frame with integral forming ring in the horizontal direction from the forming zone to the subsequent tempering and discharge zones, and other overlying similar means are provided to return the frame and forming ring from the discharge zone to the forming zone. A passageway or chamber is formed in the upper nozzle section of the tempering zone, through which may pass the frame and forming ring, as well as their horizontal driving members during the return traverse.

Abstract: In a process for the production of thermal pane of the type having an electrically conductive circuit on a glass pane, a plurality of electrically conductive inks are produced, each of which has different resistivity. On at least one side of the glass pane a continuous circuit having a constant section along its length is formed by layering each of the inks along the length of the circuit at predetermined locations so that the resistivity of the circuit changes along the length thereof.