Derek F. Case

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Sunbury, GB

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Patents Grantslast 30 patents

Information Patent Grant
Magnetic recording transducers
- Patent number 4,223,360
- Issue date Sep 16, 1980
- Data Recording Instrument Company, Ltd.
- David J. Sansom
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic core formed from laminations
- Patent number 4,217,168
- Issue date Aug 12, 1980
- Data Recording Instruments Limited
- Peter C. Ridgway
- B32 - LAYERED PRODUCTS
Information Patent Grant
Magnetic material
- Patent number 4,199,382
- Issue date Apr 22, 1980
- Data Recording Instrument Company Limited
- Peter C. Ridgway
- G11 - INFORMATION STORAGE
Information Patent Grant
Manufacture of magnetic transducing heads
- Patent number 4,188,247
- Issue date Feb 12, 1980
- Data Recording Instrument Company Limited
- Peter C. Ridgway
- G11 - INFORMATION STORAGE
Information Patent Grant
Multi-track head with shielding elements interconnected with low re...
- Patent number 4,170,033
- Issue date Oct 2, 1979
- Data Recording Instrument Company Limited
- Peter C. Ridgway
- G11 - INFORMATION STORAGE