Roy D Hoffer

47989980, Jan 17, 1989

Dec 15, 1986

6/941596

J. Marshall Hemphill - Lancaster PA
Roy D. Hoffer - Lancaster PA

Armstrong World Industries, Inc. - Lancaster PA

H05B 4136

315297

A limited power, gaseous discharge lighting system, particularly suitable for use with suspended ceilings and for safe installation without shock and/or fire hazard and for rearrangement by non-electricians without special tools or experience, the light output of which is controlled by an electronic controller which responds to the ambient light available. The system uses non-armored flexible cables to supply individual relocatable gaseous discharge lighting fixtures and dimmers, and the cables are individually plugged into receptacles which furnish power strictly limited to permit the safe use of the cables, plugs and receptacles. High frequency operation permits efficient operation with rated light output and an electronic controller furnishes additional versatility and economy.

46971220, Sep 29, 1987

Aug 1, 1986

6/891610

Roy D. Hoffer - Lancaster PA

Armstrong World Industries, Inc. - Lancaster PA

H05B 3702

315158

A room lighting control system which controls the electrical power supplied to the artificial lighting in an area based on the ambient light available. A photocell controlled digital lamp dimming circuit with particularly high stability for time and temperature is combined with a slow response time to avoid short term adjustments. A digital counter is used to determine a large number of steps over the adjustment range and the driving clock operates at a very low frequency, so that changes in light level take a relatively long time, and it takes an exceptionally long time to span the entire adjustment range.

51362163, Aug 4, 1992

Feb 15, 1991

7/655840

Frank E. Wills - York PA
Harold R. Schnetzka - Spring Grove PA
Roy D. Hoffer - Lancaster PA

York International Corporation - York PA

H02P 0736

318123

A motor drive system for driving a conventional single phase PSC motor from a two-phase power source. In one embodiment, the PSC motor is supplied from a three-phase inverter that is controlled to generate two-phase power. In another embodiment, the PSC motor is connectable through a double-pole double-throw switch to either a single phase source including a run capacitor or a two-phase inverter source.

51461471, Sep 8, 1992

Feb 28, 1991

7/662011

Frank E. Wills - York PA
Harold R. Schnetzka - Spring Grove PA
Roy D. Hoffer - Lancaster PA

York International Corporation - York PA

H02M 322

318797

A motor drive system for driving a single-phase PSC motor, in which the two motor windings are conductively isolated from each other, from a two phase power source. In one embodiment, the PSC motor is supplied from a two phase inverter circuit. The PSC motor is also connectable through a four-pole double-throw switch to either a single phase source including a run capacitor or the two phase inverter circuit.