Roger Perkins

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Oberrohrdorf, CH

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Patents Grantslast 30 patents

Information Patent Grant
Process for the production of a lightning arrester and products pro...
- Patent number 4,811,478
- Issue date Mar 14, 1989
- BBC Brown, Boveri & Company, Limited
- Gunther Maier
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Process for the preparation of a voltage-dependent ceramic resistan...
- Patent number 4,767,729
- Issue date Aug 30, 1988
- BBC Brown, Boveri & Company, Limited
- Maged A. Osman
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Process for the production of a lightning arrester and products pro...
- Patent number 4,729,053
- Issue date Mar 1, 1988
- BBC Brown, Boveri & Company, Limited
- Gunther Maier
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Zinc oxide varistor
- Patent number 4,559,167
- Issue date Dec 17, 1985
- BBC Brown, Boveri & Company, Limited
- Elias Julke
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Permanent magnet and method of making it
- Patent number 4,135,953
- Issue date Jan 23, 1979
- BBC Brown, Boveri & Company, Limited
- Hartmut Nagel
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
RE-Co-Fe-transition metal permanent magnet and method of making it
- Patent number 4,081,297
- Issue date Mar 28, 1978
- BBC Brown Boveri & Company Limited
- Hartmut Nagel
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...