Heat-insulating window glass

Claim 1

A heat-insulating glass window pane having at least one cavity (6) therein extending approximately to the marginal edges (2) of the glass pane which cavity (6) has no communication with the external faces (8, 9) of the glass pane (1) and which is evacuated to a gas pressure below 0.1 mbar, and comprising bridging members (3) in the cavity (6), which members extend transversely relative to the external faces (8, 9) of the glass pane (1) and in a section through the glass pane (1) cover less than 10% of the total area of the glass pane, characterised in that the cavity (6) represents less than 20% of the total volume of the glass pane, that the number of bridging members (3) in the cavity (6) exceeds 10,000 per square meter and that the width of said cavity is about 0.3 mm.

Claim 3

A method of manufacturing a heat-insulating glass window pane having at least one cavity (6) therein which has no communication with the external faces (8, 9) of the glass and which is evacuated to a gas pressure below 0.1 mbar, and comprising bridging members (3) in said cavity (6), said members extending transversely relative to the external faces of the glass, characterised bv applying droplets (3') in an amount exceeding 10,000 per square meter in a dot-screen pattern on one of the sides of at least one of two glass sheets (4, 5), said droplets (3') consisting of a thermosetting resin, alternatively of glass having a comparatively low melting point, bringing the glass sheets (4, 5) together with the droplets (3') abutting the opposite glass sheet and thereafter pulling the sheets slightly apart until the desired gap between the sheets of about 0.3 mm is obtained, evacuating the cavity between the sheets after setting of the plastics, alternatively solidifying of the glass droplets, and sealing the cavity (6).

Claim 4

A method of manufacturing a heat-insulating glass window pane having at least one cavity (6) therein which has no communication with the external faces (8, 9) of the glass and which is evacuated to a gas pressure below 0.1 mbar, and comprising bridging members (3) in said cavity (6), said members extending transversely relative to the external faces of the glass, characterised bv applying droplets (3') in an amount exceeding 10,000 per square meter in a dot-screen pattern on one of the sides of at least one of two glass sheets (4, 5), said droplets (3') consisting of a thermosetting resin, alternatively of glass having a comparatively low melting point, bringing the glass sheets (4, 5) together with the droplets (3') abutting the opposite glass sheet and thereafter pulling the sheets slightly apart until the desired gap between the sheets of about 0.3 mm is obtained, evacuating the cavity between the sheets after setting of the plastics, alternatively solidifying of the glass droplets, and sealing the cavity (6).