Hendrik Roelofs

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Eindhoven, NL

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Patents Grantslast 30 patents

Information Patent Grant
Low-pressure sodium vapor discharge lamp
- Patent number 4,401,914
- Issue date Aug 30, 1983
- U.S. Philips Corporation
- Gustaaf A. Wesselink
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Low-pressure mercury vapor discharge lamp with luminescent coatings...
- Patent number 4,260,931
- Issue date Apr 7, 1981
- U.S. Philips Corporation
- Gustaaf A. Wesselink
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Low-pressure discharge lamp with tortuous discharge path
- Patent number 4,237,400
- Issue date Dec 2, 1980
- U.S. Philips Corporation
- Gustaaf A. Wesselink
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Low pressure gas discharge lamp having fibers evenly distributed be...
- Patent number 4,221,988
- Issue date Sep 9, 1980
- U.S. Philips Corporation
- Jan Hasker
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of making a low-pressure gas discharge lamp
- Patent number 4,143,447
- Issue date Mar 13, 1979
- U.S. Philips Corporation
- Jan Hasker
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Discharge lamp operating circuit
- Patent number 4,074,172
- Issue date Feb 14, 1978
- U.S. Philips Corporation
- Gustaaf A. Wesselink
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Electric lamp
- Patent number 3,959,682
- Issue date May 25, 1976
- U.S. Philips Corporation
- Gustaaf Adolf Wesselink
- H01 - BASIC ELECTRIC ELEMENTS