Abstract: A glazing unit has a tempered glass pane or other frangible glazing pane carrying a glazing pane breakage detector assembly. The detector assembly includes spaced first and second electrically conductive bus pads formed of electrically conductive material on a surface of the glazing pane. An electrically resistive trace on the surface of the glazing pane is formed of electrically resistive material different from the electrically conductive material of the bus pads. The resistive trace establishes a non-short electrical interconnection between the bus pads, which can be formed of highly conductive material, such as silver-filled paint currently in widespread commercial use. Such bus pads afford a structurally sound attachment, with good electrical contact by soldering, electrically conductive epoxy or the like upon which upstanding attachment tabs are secured. Electrical leads can be attached to such upstanding tabs to connect the detector assembly to suitable security circuitry.

Abstract: A pre-assembled glass breakage detector applique has a carrier substrate which carries an electrical circuit subassembly. The electrical circuit subassembly includes an electrically conductive fragile film and spaced electrical connectors. A method of making a glazing unit security system includes pre-assembling one or more such glass breakage detector appliques and then applying the electrical circuit subassembly thereof, with or without the carrier substrate, to the surface of a glazing pane, and connecting electrical needs from continuity loss detection circuitry to the electrical connectors. In a motor vehicle application, the appliques can be applied to stationary and/or moveable vehicle windows, being especially advantageous for use on a hidden surface area of moveably mounted glazing panes. The fragile film loses electrical continuity upon disruption of the underlying glazing pane, such as upon overall fracture of a tempered glass pane upon significant fracture anywhere in the pane.

Abstract: A method of making a laminated glazing unit having an interfacial coating on a laminated ply includes depositing the coating on the laminted ply and then removing a peripheral portion of the coating. Specifically, the peripheral portion of the coating is exposed to a laser beam of sufficient power to remove the coating. The exposure time and power level are controlled to avoid damage to the underlying substrate. Subsequently, the coated substrate ply is laminated to a ply of PVB or other flexible polymeric laminating material. A substantially direct laminating bond is formed between the laminating ply and the surface of the substrate ply in the peripheral area from which the coating has been removed. The peripheral seal thus formed is environmentally durable and protects the interior of the interface from degradation due to progressive edge corrosion and the like.

Abstract: A blue glass composition is disclosed. This blue glass composition is based on a standard formulation for soda/lime silica glass, except that neither the basic glass composition nor the coloring components therefor contains nickel. The blue glass color is developed by using coloring components consisting essentially of 0.3-0.6% Fe.sub.2 O.sub.3, 0.004-0.008% Co.sub.3 O.sub.4, and 0.0001-001% Se. The particular blue color of the glass is a neutral blue having a dominant wavelength of 482 nm.+-.1 nm, color purity of 13%.+-.1% and transmission (T) equal to at least 54%.+-.1% using Illuminant C (corrected to 0.25 inch glass thickness).

Abstract: An improved electrically heated vision unit in which heat can be concentrated in a selected zone or zones thereof includes at least one sheet of a relatively rigid transparent material (12) having a ceramic enamel (14) extending along at least two opposite edges on one surface thereof. A bus bar is associated with each ceramic enamel on each edge of the sheet and has at least one narrow portion (18) overlying and bonded to an associated one of the ceramic enamel, and at least one wide portion (20) in part overlying and bonded to an associated one of said ceramic enamel and in part overlying and bonded to said one surface of the transparent material. The narrow portions and the wide portions of the pair of bus bars are in register with like portions on an opposed one of the bus bars.

Abstract: A blue glass composition is disclosed. This blue glass composition is based on a standard formulation for soda/lime silica glass, except that neither the basic glass composition nor the coloring components therefor contains nickel. The blue glass color is developed by using coloring components consisting essentially of 0.3-0.6% Fe.sub.2 O.sub.3, 0.004-0.008% .[.Co.sub.3 O.sub.4 .]. .Iadd.Co, .Iaddend.and is a neutral blue having a dominant wavelength of 482 nm.+-.1 nm, color purity of 13%.+-.1% and transmission (T) equal to at least 54%.+-.1% using Illuminant C (corrected to 0.25 inch glass thickness).