Johannes W. A. Krol

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Eindhoven, NL

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Patents Grantslast 30 patents

Information Patent Grant
Electron tube cathode
- Patent number 4,250,429
- Issue date Feb 10, 1981
- U.S. Philips Corporation
- Bernhard Lersmacher
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Electron tube with pyrolytic graphite heating element
- Patent number 4,178,530
- Issue date Dec 11, 1979
- U.S. Philips Corporation
- Bernhard Lersmacher
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Electrodes, for example grid-like electrodes for use in electron tu...
- Patent number 4,137,477
- Issue date Jan 30, 1979
- U.S. Philips Corporation
- Johannes W. A. Krol
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Method of manufacturing grid electrodes for electron tubes
- Patent number 4,120,080
- Issue date Oct 17, 1978
- U.S. Philips Corporation
- Johannes Wilhelmus Antonius Krol
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of manufacturing grid electrodes for electron tubes
- Patent number 4,034,031
- Issue date Jul 5, 1977
- U.S. Philips Corporation
- Bernhard Lersmacher
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...