Paul J. Kovacik - Ford City PA Charles R. Davidson - Natrona Heights PA Kevin B. Lindsay - Marshall MN Darrel V. Lundberg - Marshall MN Cameron A. Mulder - Minneota MN Everett Boerboom - Amiret MN
Assignee:
PPG Industries, Inc. - Pittsburgh PA
International Classification:
C03B 23203 C03B 2324
US Classification:
65 40
Abstract:
An insulated glass unit formed from a pair of glass sheets, one of which has an electroconductive coating, i. e. a first sheet, is fabricated by positioning the first sheet on a vacuum support and the other sheet, i. e. second sheet, spaced above the first sheet a sufficient distance therefrom to prevent arcing during electrical heating of the marginal edges of the second sheet. After the marginal edges of the second sheet are heated to a temperature sufficient to cause sagging of the marginal edges, the two sheets are brought together to join the marginal edges by fusion. A strip heater heats the edges of the sheet to a temperature sufficient to prevent chilling of the marginal edges of the upper sheet when contacting the marginal edges of the lower sheet. Thereafter, the sheets are separated from one another and air moved between the sheets to bloom the edes. After blooming the edges, the joined glass sheets are annealed, and an insulating gas moved into the airspace through a pore hole.
Kevin Lindsay (17 April 1924 26 April 1975) was an Australian actor, based in Britain, best known for his appearances in Doctor Who serials. He appeared as ...