Richard Donald Umphress

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Morgan Hill, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method of making magnetic disk with boron carbide overcoat layer an...
- Patent number 6,010,601
- Issue date Jan 4, 2000
- International Business Machines Corporation
- Richard Henry Ahlert
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic disk with boron carbide overcoat layer
- Patent number 5,897,931
- Issue date Apr 27, 1999
- International Business Machines Corporation
- Richard Henry Ahlert
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic disk with boron carbide overcoat layer
- Patent number 5,750,231
- Issue date May 12, 1998
- International Business Machines Corporation
- Richard Henry Ahlert
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic recorder having MR read and inductive write capability
- Patent number 5,629,682
- Issue date May 13, 1997
- International Business Machines Corporation
- Todd L. Hylton
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic disk with boron carbide overcoat layer
- Patent number 5,552,204
- Issue date Sep 3, 1996
- International Business Machines Corporation
- Richard H. Ahlert
- G11 - INFORMATION STORAGE