Jan DE Ridder

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Eindhoven, NL

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Patents Grantslast 30 patents

Information Patent Grant
Arrangement including a metal vapor discharge tube provided with at...
- Patent number 4,636,691
- Issue date Jan 13, 1987
- U.S. Philips Corporation
- Rolf E. de Man
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Electric incandescent lamp
- Patent number 4,331,901
- Issue date May 25, 1982
- U.S. Philips Corporation
- Bertus de Vrijer
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas-filled electric incandescent lamp having a cylindrical envelope...
- Patent number 3,956,659
- Issue date May 11, 1976
- U.S. Philips Corporation
- Friedrich Hermann Raymond Almer
- H01 - BASIC ELECTRIC ELEMENTS