Abstract: An electric heater plate is disclosed comprising a sheet of tempered glass with a metallized aluminum circuit extending over the face thereof for carrying an electrical heating current. At the terminals of the metallized aluminum circuit there is provided a terminal area of silver between the glass and the metallized aluminum coating, which silver terminals are each exposed through a small opening in the metallized aluminum coating such that lead wires may be soldered to the silver through said openings.

Abstract: In a noble-metal containing resistor paste, there is added a quantity of colloidal aluminum oxide hydroxide (AlOOH) in order to make an upward adjustment in the TCR of the fired resistor film. The additions of AlOOH have only a small effect on the resistivity and usually causes a downward change in the resistivity value.

Abstract: A temperature sensing device and a method of forming it is disclosed. A first film or coating of an adherent electro-conductive metallic oxide is applied over the exterior surface of a dielectric substrate. The metal oxide coating is thereafter thoroughly cleansed and a second coating or layer of a metal having a relatively high temperature coefficient of resistance is applied over the metallic oxide film so as to form a strong physical bond as well as a chemical bond therebetween. The composite so formed is fired at a temperature up to about 750.degree.C. If desired, the metal layer is thereafter suitably spiralled to provide the desired resistance and terminal leads are attached to the element. Also, if desired, the element is then coated with a dielectric protective coating.

Abstract: A method is disclosed for producing intricate metal designs bonded to glass such as required in electrical resistance heating circuits, microwave oven panel shields and the like. The method includes the application to a sheet of glass of the negative of the desired design by silk screening or other screening techniques utilizing a screenable pasting agent which screens through the negative pattern and adheres temporarily to the glass. The entire sheet of glass is then coated with the desired metal, usually aluminum, according to known metallizing techniques in which flame-atomized metal is applied to the heated glass sheet and thus bonds thereto. The metallized surface is then brushed with wire rotary brushes which remove the metal from those areas where the screenable pasting agent has been applied. After washing, further wet brushing, rinsing and drying, the positive desired design in metal remains securely bonded to the glass.

Abstract: A method of making a voltage sensitive switch characterized by an irreversible change in resistance from a high resistance state greater than one megohm to a low resistance state less than approximately one hundred ohms is described as comprising heating substantially pure grade copper in an oxidizing environment for a sufficient time to oxidize the outer surface of the copper powder, mixing the oxidized copper powder with a binder and applying the mixture to a pair of spaced electrodes.

Abstract: A method of making a voltage sensitive switch characterized by an irreversible change in resistance from a high resistance state greater than one megohm to a low resistance state less than one thousand ohms is described as comprising mixing substantially pure grade copper powder with copper oxide powder, adding a binder to the mixture and applying the resulting mixture to a pair of spaced electrodes.

Abstract: A process for providing a margin in a metallized resin film for a condenser element which is characterized by providing on a dielectric resinous layer a water-soluble coating layer having a pattern corresponding to a margin pattern, providing a metal deposition layer on the resinous layer including a coated part and a non-coated part and removing the water-soluble coating layer and the metal deposition layer thereon by washing with water. According to the process, a metallized resin film having an arbitrary margin pattern and a superior electrical property can be readily obtained, with completely eliminating any complexity of the procedure and disadvantage in conventional processes for providing a margin.