Darrell E. Bratvold

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Rochester, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Structure and enclosure assembly for a disk drive
- Patent number 6,285,524
- Issue date Sep 4, 2001
- International Business Machines Corporation
- Jeffrey Fred Boigenzahn
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Enclosure assembly for a disk with a locational and retention cast...
- Patent number 5,872,678
- Issue date Feb 16, 1999
- International Business Machines Corporation
- Jeffrey Fred Boigenzahn
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Structure and enclosure assembly for a disk drive
- Patent number 5,872,679
- Issue date Feb 16, 1999
- International Business Machines Corporation
- Jeffrey Fred Boigenzahn
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Structure and enclosure assembly for a disk drive
- Patent number 5,539,595
- Issue date Jul 23, 1996
- International Business Machines Corporation
- John L. Beck
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Noninfluencing fastener for disk drives
- Patent number 4,945,435
- Issue date Jul 31, 1990
- International Business Machines Corporation
- Jeffrey F. Boigenzahn
- G11 - INFORMATION STORAGE
Information Patent Grant
Disk drive enclosure with an inclined parting surface
- Patent number 4,724,499
- Issue date Feb 9, 1988
- International Business Machines Corporation
- Darrell E. Bratvold
- G11 - INFORMATION STORAGE