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Ralf Schafer
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Aachen, DE
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last 30 patents
Information
Patent Grant
Lamp envelope with a metal clamping member and a fixation member
Patent number
5,742,114
Issue date
Apr 21, 1998
U.S. Philips Corporation
Hans J. Kohl
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Capped high-pressure discharge lamp
Patent number
5,736,811
Issue date
Apr 7, 1998
U.S. Philips Corporation
Manfred Westemeyer
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Capped electric lamp
Patent number
5,654,608
Issue date
Aug 5, 1997
U.S. Philips Corporation
Manfred Westemeyer
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Circuit arrangement for supplying a load
Patent number
5,113,085
Issue date
May 12, 1992
U.S. Philips Corporation
Ralf Schafer
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Circuit arrangement for A.C. operation of high-pressure gas dischar...
Patent number
5,025,197
Issue date
Jun 18, 1991
U.S. Philips Corporation
Hans G. Ganser
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Circuit arrangement for starting and operating gas discharge lamps
Patent number
4,994,716
Issue date
Feb 19, 1991
U.S. Philips Corporation
Hans-Gunther Ganser
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Circuit arrangement for adjusting the operating voltage of high-pre...
Patent number
4,891,563
Issue date
Jan 2, 1990
U.S. Philips Corporation
Hans G. Ganser
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Circuit for operating gas discharge lamps with a periodically alter...
Patent number
4,888,524
Issue date
Dec 19, 1989
Hans-Gunther Ganser
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Heatable electrode for high-pressure gas discharge lamps
Patent number
4,839,560
Issue date
Jun 13, 1989
U.S. Philips Corporation
Hans G. Ganser
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Circuit arrangement for operating a high-pressure gas discharge lamp
Patent number
4,816,721
Issue date
Mar 28, 1989
U.S. Philips Corp.
Hans G. Ganser
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Circuit arrangement for operating high-pressure gas discharge lamps
Patent number
4,812,736
Issue date
Mar 14, 1989
U.S. Philips Corp.
Manfred Albach
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Circuit arrangement for A.C. operation of gas discharge lamps
Patent number
4,748,381
Issue date
May 31, 1988
U.S. Philips Corporation
Hans-Gunther Ganser
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Circuit arrangement for igniting and operating gas discharge lamps
Patent number
4,714,862
Issue date
Dec 22, 1987
U.S. Philips Corporation
Horst Dannert
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
High-pressure discharge lamp
Patent number
4,644,216
Issue date
Feb 17, 1987
Ralf Schafer
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Circuit arrangement for operating high-pressure gas discharge lamps
Patent number
4,594,531
Issue date
Jun 10, 1986
U.S. Philips Corporation
Hans G. Ganser
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Circuit arrangement for starting and operating a high-pressure gas...
Patent number
4,539,513
Issue date
Sep 3, 1985
U.S. Philips Corporation
Hans G. Ganser
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Circuit arrangement for operating a high-pressure gas discharge lamp
Patent number
4,471,269
Issue date
Sep 11, 1984
U.S. Philips Corporation
Hans G. Ganser
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER