Inventor
Jeffrey A. Heydt
Inventor
Oklahoma City, OK, US
Overview
Patents· 10 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer64%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters21%
G01RMeasuring electric variables7%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests7%
PatentTitleYear
7,432,677'Closed-loop rotational control of a brushless dc motor'20087,197,410'Predicting loss of frequency lock between a motor control circuit and a motor'20077,062,160'Monitoring current in a motor during acceleration to verify motor frequency lock'20067,046,463'Low flying head detection using readback signal amplitude modulation'20066,876,510'Detecting head landings on a data zone of a data storage disc'20056,768,609'Reducing position error signal nonlinearity through iterative calibration of a compensation table'20046,710,567'Velocity dependent reference profile for spindle motor acceleration control'20046,664,749'Spindle motor initialization after a control processor reset condition in a disc drive'20036,577,088'Closed loop spindle motor acceleration control in a disc drive'20036,487,033'Motor speed observer for data protection in a disc drive'2002Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
2002–2008Patents assigned to SEAGATE TECHNOLOGY LLC (10)· patent assignee history
2002–2006Based in Oklahoma City, OK, US· patent location history
2007–2008Based in Longmont, CO, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SEAGATE TECHNOLOGY LLC | 10 | 2002–2008 |
Locations
| Location | Patents | Span |
|---|---|---|
| Oklahoma City, OK, US | 8 | 2002–2006 |
| Longmont, CO, US | 2 | 2007–2008 |