| Patent | Date |
|---|
Frequency tunable resonant scanner
Grant 6,803,561 - Dunfield October 12, 2 | 2004-10-12 |
Frequency tunable resonant scanner
App 20030122066 - Dunfield, John C. | 2003-07-03 |
Frequency tunable resonant scanner
Grant 6,525,310 - Dunfield February 25, 2 | 2003-02-25 |
Frequency tunable resonant scanner
App 20020014579 - Dunfield, John C. | 2002-02-07 |
Frequency tunable resonant scanner
Grant 6,331,909 - Dunfield December 18, 2 | 2001-12-18 |
Slotless spindle motor for disc drive
Grant 5,850,318 - Dunfield , et al. December 15, 1 | 1998-12-15 |
Disc drive spindle motor with rotor isolation and controlled resistance electrical pathway from disc to ground
Grant 5,729,404 - Dunfield , et al. March 17, 1 | 1998-03-17 |
Low leakage actuator for high performance
Grant 5,698,911 - Dunfield , et al. December 16, 1 | 1997-12-16 |
Stator isolation for spindle motor
Grant 5,619,389 - Dunfield , et al. April 8, 1 | 1997-04-08 |
Passive magnetic bearings for a spindle motor
Grant 5,619,083 - Dunfield , et al. April 8, 1 | 1997-04-08 |
Passive magnetic bearings for a spindle motor
Grant 5,610,463 - Dunfield , et al. March 11, 1 | 1997-03-11 |
Integrated passive magnetic bearing system and spindle magnet for use in an axial magnet spindle motor
Grant 5,598,048 - Dunfield , et al. January 28, 1 | 1997-01-28 |
Method for starting and commutating a permanent-magnet direct current motor having a single phase winding
Grant 5,598,071 - Dunfield , et al. January 28, 1 | 1997-01-28 |
Hydrodynamic spindle motor having distributed windings
Grant 5,590,003 - Dunfield , et al. December 31, 1 | 1996-12-31 |
Integrated passive magnetic bearing system and spindle magnet for use in an axial magnet spindle motor
Grant 5,587,617 - Dunfield , et al. December 24, 1 | 1996-12-24 |
Magnetic crash stop and latch in a disc drive
Grant 5,581,424 - Dunfield , et al. December 3, 1 | 1996-12-03 |
Ironless spindle motor for disc drive
Grant 5,579,188 - Dunfield , et al. November 26, 1 | 1996-11-26 |
Detection of starting motor position in a brushless DC motor
Grant 5,569,990 - Dunfield October 29, 1 | 1996-10-29 |
Support flange having electrical contacts to provide electrical continuity upon spindle motor mounting to base
Grant 5,548,458 - Pelstring , et al. August 20, 1 | 1996-08-20 |
Passive magnetic bearings for a spindle motor
Grant 5,541,460 - Dunfield , et al. July 30, 1 | 1996-07-30 |
Wire guide and adhesive retaining ring for disc drive spindle motor
Grant 5,481,144 - Dunfield , et al. January 2, 1 | 1996-01-02 |
Space optimization voice coil motor for disc drives
Grant 5,260,618 - Dunfield , et al. November 9, 1 | 1993-11-09 |
Position detection for a brushless DC motor without Hall effect devices using a mutual inductance detection method
Grant 5,254,914 - Dunfield , et al. October 19, 1 | 1993-10-19 |
Position detection for a brushless DC motor without hall effect devices using a time differential method
Grant 5,028,852 - Dunfield July 2, 1 | 1991-07-02 |
Print tip contact sensor for quiet impact printer
Grant 4,678,355 - Gabor , et al. July 7, 1 | 1987-07-07 |
Adaptive print hammer damper
Grant 4,538,930 - Dunfield September 3, 1 | 1985-09-03 |
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