General Electric Company

Joe Wong

Eric Lifshin

Joseph D Cargioli

Stephen J Schroder

Francis P Bundy

Jan W Szymaszek

A copper-clad laminate having special utility in the production of high resolution printed circuit patterns by either subtractive or semi-additive processing is made by vapor depositing a film of zinc on a copper film on a silica-coated aluminum carrier sheet, vapor depositing a silica film on the resulting zinc-copper foil, bonding the resulting body to a substrate and then stripping the silica-coated aluminum carrier sheet from the copper-clad laminate.

Method of transfer lamination of copper thin sheets and films

Transfer lamination of copper thin sheets and films, method and product

A copper-clad laminate having special utility in printed circuit board production because of its extremely smooth and virtually pinhole-free surface is made by vapor depositing a copper film on a layer of silica on an aluminum carrier sheet, electrodepositing a layer of copper on the film to form a foil, bonding the foil to a substrate and finally stripping the foil and substrate laminate from the silica-coated carrier sheet.

Transfer lamination of vapor deposited foils, method and product

A method for producing varistors and varistor powder is disclosed in which the zinc oxide powder is predoped with certain desired impurities in order to keep these impurities out of the intergranular phase which is known to exist in sintered metal oxide varistors. In particular, certain trivalent dopants are added to increase the zinc oxide grain conductivity without the usually concomitant increase in higher leakage current. In particular, the method disclosed herein is especially important for the doping of varistor material with aluminum at low levels of concentration.

Varistors with upturn at high current level

The leakage current in metal oxide varistor bodies is found to vary as a function of applied pressure in the 0.5 kbar to 10 kbar range. A pressure sensing device is conditioned by first prestressing a metal oxide varistor to a pressure above the range of measurement and then releasing the prestress pressure. Upon application of subsequent pressures equal or less than the prestress pressure, the leakage current in the device is found to vary as a function of pressure.

Metal oxide varistor pressure sensor and method

A method for manufacturing metal oxide varistors with an extremely homogeneous dispersion of metal oxides is disclosed. In accordance with one embodiment of the invention, nitrates of zinc and certain metal additives are heated to form a hydrated solution which is further heated to form a dehydrated melt, which is further heated to form an extremely homogeneous dispersion of the metal oxides. Tin and antimony are added as oxides rather than nitrates. This process eliminates the need for ball milling.

Method of making homogenous metal oxide varistor powders

The zinc oxide grain size and breakdown voltage characteristics of polycrystalline zinc oxide varistors may be controlled by adjusting sintering times and temperatures. Varistor ceramics formed by sintering constituent metal oxides for long periods are found to have substantially different microstructure from prior art varistors.

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Schenectady, NY, United States of America

Joe Wong