John C. Dunfield

Person

Santa Cruz County, CA, US

People

Patents Grantslast 30 patents

Information Patent Grant
Microactuator for fine positioning in a disc drive
- Patent number 6,538,836
- Issue date Mar 25, 2003
- Seagate Technology LLC
- John Charles Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Microactuator for fine positioning in a disc drive
- Patent number 6,335,850
- Issue date Jan 1, 2002
- Seagate Technology, Inc.
- John Charles Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Method of magnetizing a ring-shaped magnet
- Patent number 6,080,352
- Issue date Jun 27, 2000
- Seagate Technologies, Inc.
- John C. Dunfield
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Grounding and conductivity improvement for ferrofluid seals
- Patent number 6,029,978
- Issue date Feb 29, 2000
- Seagate Technology, Inc.
- Robert Michael Pelstring
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Magnetic disc drive having magnetic particle trap for hydrodynamic...
- Patent number 5,956,204
- Issue date Sep 21, 1999
- Seagate Technology, Inc.
- John Charles Dunfield
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Disk drive spindle motor assembly with stator having a resilient co...
- Patent number 5,949,613
- Issue date Sep 7, 1999
- Seagate Technology, Inc.
- Michael Bruce Moir
- G11 - INFORMATION STORAGE
Information Patent Grant
Oil filling seal for hydrodynamic motor utilizing a movable sealing...
- Patent number 5,938,343
- Issue date Aug 17, 1999
- Seagate Technology, Inc.
- Alan L. Grantz
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Hydrodynamic bearing including means for monitoring the capacitance...
- Patent number 5,936,410
- Issue date Aug 10, 1999
- Seagate Technology, Inc.
- John C. Dunfield
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Distributed spindle motor integrated with disc
- Patent number 5,907,455
- Issue date May 25, 1999
- Seagate Technology, Inc.
- John Charles Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Slotless spindle motor for disc drive
- Patent number 5,850,318
- Issue date Dec 15, 1998
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Disc drive spindle motor with controlled resistance pathway from di...
- Patent number 5,844,748
- Issue date Dec 1, 1998
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Detection of starting motor position in a brushless DC motor
- Patent number 5,841,252
- Issue date Nov 24, 1998
- Seagate Technology, Inc.
- John C. Dunfield
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Support flange having electrical contacts to provide electrical con...
- Patent number 5,815,345
- Issue date Sep 29, 1998
- Seagate Technology, Inc.
- Robert Michael Pelstring
- G11 - INFORMATION STORAGE
Information Patent Grant
Disc drive cartridge including magnetic bearings
- Patent number 5,808,839
- Issue date Sep 15, 1998
- Seagate Technology, Inc.
- John Charles Dunfield
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Retaining ring for disc drive spindle motor
- Patent number 5,774,974
- Issue date Jul 7, 1998
- Seagate Technology, Inc.
- John Charles Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Disc drive spindle motor with rotor isolation and controlled resist...
- Patent number 5,729,404
- Issue date Mar 17, 1998
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Low leakage actuator for high performance
- Patent number 5,698,911
- Issue date Dec 16, 1997
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Spindle motor having overmolded stator
- Patent number 5,694,268
- Issue date Dec 2, 1997
- Seagate Technology, Inc.
- John Charles Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Method and apparatus for dynamic low voltage spindle motor operation
- Patent number 5,675,230
- Issue date Oct 7, 1997
- Seagate Technology, Inc.
- John C. G. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Small form factor actuator for improved functionality and linearity
- Patent number 5,659,215
- Issue date Aug 19, 1997
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Method and apparatus for dynamic low voltage spindle motor operation
- Patent number 5,633,568
- Issue date May 27, 1997
- Seagate Technology, Inc.
- John Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Stator isolation for spindle motor
- Patent number 5,619,389
- Issue date Apr 8, 1997
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Passive magnetic bearings for a spindle motor
- Patent number 5,619,083
- Issue date Apr 8, 1997
- Seagate Technology, Inc.
- John C. Dunfield
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Passive magnetic bearings for a spindle motor
- Patent number 5,610,463
- Issue date Mar 11, 1997
- Seagate Technology, Inc.
- John C. Dunfield
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Particle containment and fluid retention with barrier seal in magne...
- Patent number 5,600,511
- Issue date Feb 4, 1997
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Method for starting and commutating a permanent-magnet direct curre...
- Patent number 5,598,071
- Issue date Jan 28, 1997
- Seagate Technology
- John C. Dunfield
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Integrated passive magnetic bearing system and spindle magnet for u...
- Patent number 5,598,048
- Issue date Jan 28, 1997
- Seagate Technology, Inc.
- John C. Dunfield
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Hydrodynamic spindle motor having distributed windings
- Patent number 5,590,003
- Issue date Dec 31, 1996
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE
Information Patent Grant
Integrated passive magnetic bearing system and spindle magnet for u...
- Patent number 5,587,617
- Issue date Dec 24, 1996
- Seagate Technology, Inc.
- John C. Dunfield
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Magnetic crash stop and latch in a disc drive
- Patent number 5,581,424
- Issue date Dec 3, 1996
- Seagate Technology, Inc.
- John C. Dunfield
- G11 - INFORMATION STORAGE

John C. Dunfield

Person

Patents Grantslast 30 patents

Microactuator for fine positioning in a disc drive

Microactuator for fine positioning in a disc drive

Method of magnetizing a ring-shaped magnet

Grounding and conductivity improvement for ferrofluid seals

Magnetic disc drive having magnetic particle trap for hydrodynamic...

Disk drive spindle motor assembly with stator having a resilient co...

Oil filling seal for hydrodynamic motor utilizing a movable sealing...

Hydrodynamic bearing including means for monitoring the capacitance...

Distributed spindle motor integrated with disc

Slotless spindle motor for disc drive

Disc drive spindle motor with controlled resistance pathway from di...

Detection of starting motor position in a brushless DC motor

Support flange having electrical contacts to provide electrical con...

Disc drive cartridge including magnetic bearings

Retaining ring for disc drive spindle motor

Disc drive spindle motor with rotor isolation and controlled resist...

Low leakage actuator for high performance

Spindle motor having overmolded stator

Method and apparatus for dynamic low voltage spindle motor operation

Small form factor actuator for improved functionality and linearity

Method and apparatus for dynamic low voltage spindle motor operation

Stator isolation for spindle motor

Passive magnetic bearings for a spindle motor

Passive magnetic bearings for a spindle motor

Particle containment and fluid retention with barrier seal in magne...

Method for starting and commutating a permanent-magnet direct curre...

Integrated passive magnetic bearing system and spindle magnet for u...

Hydrodynamic spindle motor having distributed windings

Integrated passive magnetic bearing system and spindle magnet for u...

Magnetic crash stop and latch in a disc drive