Westinghouse Electric Corporation

US Government As Represented by the Secretary of the Army

Peter R Emtage

Robert C Miller

Philip J Nalepa

George T Mallick

Koon W Loh

Thomas A Temofonte

The surface of a substrate is passivated by the introduction of a thin la of (Hg,Cd)Te, of increased Cd content, on the substrate surface before the growth of the desired composition of (Hg,Cd)Te.

Method of passivating a substrate surface

A magnetostatic wave device which has broad application in the signal processing arena is disclosed herein. Basically, the magnetostatic wave device includes a layer of magnetized magnetic medium having a surface which includes a prespecified area to support the propagation of magnetostatic waves. A generator element is disposed at one end of the propagation area and is operative to carry an electromagnetic signal to generate magnetostatic waves supported by the propagation area. A pattern of conductive material having a plurality of conductive paths commonly coupled together at both ends is disposed in juxtaposition with the propagation area of the magnetic medium surface. In one embodiment, the conductive pattern includes a variable impedance coupled to each of a desired number of the conductive paths thereof to vary the impedance of the path. Each variable impedance is adjustable controlled in accordance with an applied governing signal. A receiver element is disposed at the other end of the propagation area and is operative to receive the propagated magnetostatic waves and render an output electromagnetic signal. More specifically, the pattern of conductive paths may include a planar array of a plurality of metallic strips disposed in juxtaposition with the propagation area of the magnetic medium surface and aligned in a substantially parallel array with spacings of no more than half a wavelength of the propagated magnetostatic wave apart. The parallel array alignment is transverse to the propagation path of the magnetostatic wave.

Magnetostatic wave device

A circuit breaker including a flux transfer trip mechanism and a solid state passive overcurrent sensing device having a temperature-dependent switching resistor of resistance material such as vanadium dioxide or lanthanum cobalt oxide.

Circuit breaker with solid state passive overcurrent sensing device

An improved composition of VO.sub.2 current inrush limiting ceramics for incandescent lamps using a 0.003-0.06 weight percent MoO.sub.3 addition. This addition modifies the resistance-temperature relationship to provide a more gradual transition and also to provide a resistance which varies less at temperatures below the transition temperature. The more gradual change is desirable as it reduces the tendency for a delayed current overshoot and also reduces the tendency for the current to be funnelled through a relatively small portion of the thermistor. The more nearly constant low temperature resistance provides good current inrush limiting in a wider range of ambient temperatures.

Composition for VO.sub.2 incandescent lamp current inrush limiters

An arrangement to eliminate the initial current overshoot which normally occurs when a tungsten incandescent lamp is connected to a power source. The arrangement uses a negative temperature coefficient thermistor having a certain predetermined mass. It has been determined that a practical limiter to eliminate current overshoot can be made only when the mass of the limiter is within a relatively narrow range. The hot and cold resistance of the limiter must also be within prescribed ranges to give a limiter which is not only effective in eliminating the current overshoot, but also efficient in steady state operation such that the limiter dissipates less than 1% of the total power.

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Pittsburgh, PA, United States of America

Peter R Emtage