4. Dynamic magnetic information storage or retrieval
  5. General recording or reproducing
  6. Recording-or erasing-prevention

Jeffrey A. Heydt

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Closed loop spindle motor acceleration control in a disc drive

Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate

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Closed-loop rotational control of a brushless dc motor

Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate

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Detecting head landings on a data zone of a data storage disc

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate

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Low flying head detection using readback signal amplitude...

Dynamic magnetic information storage or retrieval – Checking record characteristics or modifying recording...
Reexamination Certificate

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Monitoring current in a motor during acceleration to verify...

Electricity: motor control systems – Closed loop acceleration control system for dc motor with... – Armature control
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Profile ID: LFUS-PAI-P-2511945

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