Spencer Donald Roberts

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San Jose, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Acquiring focus in an optical system using a soft focus acquiring s...
- Patent number 5,128,913
- Issue date Jul 7, 1992
- International Business Machines Corporation
- Alan A. Fennema
- G11 - INFORMATION STORAGE
Information Patent Grant
Positioning systems including reliable track crossing detection for...
- Patent number 5,038,333
- Issue date Aug 6, 1991
- International Business Machines Corporation
- William W. Chow
- G11 - INFORMATION STORAGE
Information Patent Grant
Transducer positioning servo mechanisms employing digital and analo...
- Patent number 4,914,725
- Issue date Apr 3, 1990
- International Business Machines Corporation
- Karl A. Belser
- G05 - CONTROLLING REGULATING
Information Patent Grant
Tape motion control for reel-to-reel drive
- Patent number 4,125,881
- Issue date Nov 14, 1978
- International Business Machines Corporation
- John J. Eige
- G11 - INFORMATION STORAGE
Information Patent Grant
Adaptive reel-to-reel tape control system
- Patent number 4,015,799
- Issue date Apr 5, 1977
- International Business Machines Corporation
- John Alexander Koski
- G11 - INFORMATION STORAGE