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Ralf Schafer
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Eindhoven, NL
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last 30 patents
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Patent Grant
Operating circuit for a high-pressure discharge lamp
Patent number
5,039,916
Issue date
Aug 13, 1991
U.S. Philips Corporation
Lodewijk H. M. Meessen
H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Patent Grant
High-pressure sodium vapor discharge lamp
Patent number
4,795,943
Issue date
Jan 3, 1989
U.S. Philips Corporation
Petrus H. Antonis
H01 - BASIC ELECTRIC ELEMENTS