B - Operations – Transporting – 64 – D
Patent
B - Operations, Transporting
64
D
154/106, 154/45,
B64D 15/12 (2006.01) B32B 17/10 (2006.01) B64C 1/14 (2006.01) H05B 3/28 (2006.01) H05B 3/86 (2006.01) H05F 3/02 (2006.01)
Patent
CA 1098812
ABSTRACT OF THE DISCLOSURE This relates to transparent heated windows having an outer surface of hard plastic suitable for use in lightweight aircraft. A typical embodiment of this invention includes a composite transparency or window comprising an outer ply of relatively hard transparent acrylic plastic having a first circuit comprising relatively widely spaced wires embedded adjacent the outer major surface thereof and a second circuit comprising relatively closely spaced wires embedded adjacent the inner major surface thereof and an inner layer of hard transparent plastic selected from the class consisting of polycarbonate and acrylic plastics fused to said other major surface of said outer ply. Terminal means are connected to the first circuit and adapted for connection to a ground to enable the first circuit to dissipate electrical charge that develops on the outer surface of the window before the charge increases to the point where it discharges at high voltage through the second circuit and damages the window, so that the first circuit behaves as an anti-static circuit when grounded. Additional terminal means adapted for connection to a voltage source is connected to the second circuit to enable the second circuit to operate as a heating circuit when so connected.
276736
Bitterice Michael G.
Keslar Leroy D.
Gowling Lafleur Henderson Llp
Ppg Industries Inc.
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