North American Philips Corporation

Advance Transformer Company

Philips Electronics North America Corporation

Other

501 Advance Transformer Company

Joseph S Droho

Robert W Wisbey

Ray G Gibson

Glenn D Garbowicz

Seymour Perkins, Iii

John A Larson

Henry Pikul

Edmond Daniel

Dale C McClurg

A method for bringing a predetermined turn of a coil located inside the width of the coil and beneath at least one layer of the coil and a coil made by such method.

Unique electrical coil with tap

A method for a loop of a predetermined turn of a coil located inside the width of the coil and beneath at least one layer of the coil.

Method of making an electrical coil

A transformer in which the primary coil and the secondary coil are insulated from the iron laminations which form part of its flux paths by insulated covers which snap-on to the primary and secondary coils.

Electrical transformer structure with coil covers

A ballast for lighting an auxiliary source of illumination whenever a primary source of illumination fails to ignite. The auxiliary source of illumination is effectively turned OFF by placing a short circuit thereacross whenever the primary source of illumination is lit. The short circuit is removed whenever the primary source of illumination fails to reach a predetermined level of illumination thereby permitting current to flow through and light the auxiliary source of light. The ballast also includes a power factor correction device for increasing the ballast power factor when the primary source of light reaches a predetermined level of illumination.

HID lamp and auxiliary lamp ballast using a single multiple function

An arrangement for use with gaseous discharge lamp circuits having a power factor capacitor in which the capacitor can be disconnected from the circuit when the lamp is not drawing current and in which an emergency lamp can be connected across a voltage source when the discharge lamp is not drawing current.

Combination including an emergency lighting arrangement

A starting and operating circuit for a discharge lamp in which the ballast reactance includes first, second and third coil segments with the third coil segment comprising part of the ignitor circuit and being electrically connected between the first and second coil segments.

Ignitor circuit for discharge lamps with novel ballast

Control equipment for motors having two windings and wherein both windings are temporarily connected in parallel to start the motor.

Control equipment for multi-speed electric motors

An arrangement for use with gaseous discharge lamp circuits having power factor capacitors in which the capacitor is disconnected from the circuit when the lamp is not drawing current.

Ballast circuit with means to disconnect power factor capacitor

An ignitor or starting circuit for a high pressure arc discharge lamp including a voltage sensitive bidirectional switch and an impedance with a resistor and inductor in series circuit. An additional capacitor is connected in parallel across the voltage sensitive switch and the resistor.

Ignitor for high pressure arc discharge lamps

A discharge lamp comprises an HPS discharge device within an outer envelope filled with inert gas. A normally nonconductive spark gap device within the outer envelope is connected across conductors used to apply a voltage to the HPS discharge device. The spark gap breaks down when the applied voltage exceeds a certain value to prevent breakdown through the inert gas within the outer envelope.

High pressure sodium discharge lamp having gas filled outer envelope

A starting and operating circuit for a discharge lamp in which the ballast reactance includes first, second and third coil segments with the third coil segment compromising part of the ignitor circuit and being electrically connected between the first and second coil segments.

A hybrid ballast apparatus for starting and operating a plurality of series-connected discharge lamps and which provides protection against electric shock. The ballast apparatus includes first and second bidirectional thyristors connected in parallel with first and second ones of said lamps, respectively, and a trigger control circuit for simultaneously triggering the thyristors into conduction. Each lamp has two filaments and means are provided for connecting an L-C ballast device, the lamp filaments and the first and second thyristors in a series circuit across the AC supply voltage terminals. If one end of a lamp is removed from its socket, the series circuit is opened so that the maximum voltage at any lamp electrodes is limited to the AC supply voltage.

Hybrid ballast for multiple discharge lamps

A thermal protection device for a dual input voltage lighting fixture apparatus which includes a reversible connector for coupling either of two possible input voltages to the appropriate terminal of a winding of a transformer/ballast apparatus via a normally closed contact of a heat responsive thermal switch having a heating element electrically coupled to the reversible connector and thermally coupled to the closed contact. The latter contact opens in response to a level of heat above a given value. The transformer winding has two connection terminals, one of which is a tap point, connected to the reversible connector. The connection scheme provides the same energizing voltage to the heating element for each of the two different possible levels of the input voltage. The apparatus will automatically indicate if the connector is reverse connected for either of the two input voltages.

Growing community of inventors

Chicago, IL, United States of America

Joseph S Droho