Inventor
David H. F. Harper
Inventor
Vail, AZ, US
Overview
Patents· 54 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 transducer73%
H02KDynamo-electric machines10%
Y10TTechnical subjects covered by former us classification5%
H01LSemiconductor devices3%
H10NElectric solid-state devices not otherwise provided for3%
B42FSheets temporarily attached together1%
B65HHandling thin or filamentary material, e.g. sheets, webs, cables1%
F16HGearing1%
H02NElectric machines not otherwise provided for1%
H05KPrinted circuits1%
PatentTitleYear
11,056,139Semi-flexible structure for micro-positioning a write/read head202110,957,362Non-interfering micro-positioning system utilizing piezoelectric elements202110,854,236Dynamic tape guide bearing tilt mechanism202010,832,724Damping lateral tape motion disturbances202010,789,980Attenuating reaction forces caused by externally supported stators in brushless DC motors202010,783,919Attenuating reaction forces caused by internally supported stators in brushless DC motors202010,679,662Tape drive bearing temperature control202010,614,846Measuring servo reader span on a magnetic recording head202010,580,443Planar mono coil for two stage head actuator202010,553,245Damping lateral tape motion disturbances202010,515,663Tape drive bearing temperature control201910,424,332Attenuating reaction forces caused by internally supported stators in brushless DC motors201910,424,333Attenuating reaction forces caused by externally supported stators in brushless DC motors201910,410,670Tape drive temperature control for media dimensional stability201910,395,682Achieving fine motion between modules in a magnetic head201910,395,687Tape drive bearing temperature control201910,374,475Reduced reel motor disturbances in a tape drive system201910,332,554Tape drive temperature control for media dimensional stability201910,236,023Planar mono coil for two stage head actuator20199,997,181Actuator coil temperature estimation using skew values20189,984,720Damping lateral tape motion disturbances20189,947,354Utilization of multiple writer modules for simultaneously writing two times the number of data tracks in a compact form factor20189,892,751'Achieving fine motion between modules in a magnetic head'20189,685,189'Reduced reel motor disturbances in a tape drive system'20179,626,993'Actuator coil temperature estimation using skew values'20179,583,126'Dual-path flex circuit'20179,548,077'Detecting and compensating for external vibration in a tape drive'20179,466,334'Monolithic tape head and actuator for high density recording'20169,449,637'Reduced reel motor disturbances in a tape drive system'20169,424,869'Device and method for controlling the position of a head relative to a tape within a tape transport system'20169,355,663'Multiple degree of freedom actuator assemblies having flexure based pivot functionality'20169,251,821'Attenuation of a pitch mode for actuator assemblies having multiple degrees of freedom'20169,087,539'Device and method for controlling the position of a head relative to a tape within a tape transport system'20158,958,170'Management of tape drive quality using discrete fourier transform analysis'20158,749,922'Magnetically biased tilting roller bearing tape guidance'20148,743,508'Magnetically biased tilting roller bearing tape guidance'20148,638,523'Enabling partial write during a tape skew'20148,270,114'Magnetically biased tilting roller bearing tape guidance'20128,270,108'Method to minimize the effects of tape skew and tape dimensional stability'20128,035,926'System including a pivot assembly for adjusting misalignment and skew between a read/write head and a flexible data storage media'20117,845,067'Actuator assembly method'20107,839,598'Balanced linkage actuation of tape head'20107,724,466'Method and system for servo stripe width detection and compensation'20107,660,076'Helical gear actuator for tape drive systems'20107,649,710'Moving magnet actuation of tape head'20107,538,980'Actuator assembly'20097,444,894'Linear actuator with wear-resistant ceramic bushing'20087,414,812'Actuator assembly'20087,092,196'Characteristic measurement of an actuation drive coil and associated damping mechanism'20067,061,712'Mono pole piece for a two stage tape drive actuator'20066,934,108'Servo pattern based tape tension control for tape drives'20056,639,760'Compliant worm gear and worm gear bracket'20035,630,626'Information guides'19974,924,337'Disk drive servo shield'1990Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1990Based in Boulder, CO, US· patent location history
1997Based in Vancouver, CA· patent location history
2003–2021Patents assigned to IBM (52)· patent assignee history
2003–2010Based in San Jose, CA, US· patent location history
2010–2021Based in Vail, AZ, US· patent location history
2012–2014Patents assigned to ARGUMEDO ARMANDO JESUS (3)· patent assignee history
2012–2014Patents assigned to BUI NHAN XUAN (3)· patent assignee history
2012–2014Patents assigned to DYER WILLIAM MARVIN (3)· patent assignee history
2012–2014Patents assigned to HANCOCK REED ALAN (3)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| IBM | 52 | 2003–2021 |
| ARGUMEDO ARMANDO JESUS | 3 | 2012–2014 |
| BUI NHAN XUAN | 3 | 2012–2014 |
| DYER WILLIAM MARVIN | 3 | 2012–2014 |
| HANCOCK REED ALAN | 3 | 2012–2014 |
Locations
| Location | Patents | Span |
|---|---|---|
| Vail, AZ, US | 43 | 2010–2021 |
| San Jose, California, US | 9 | 2003–2010 |
| Vancouver, CA | 1 | 1997 |
| Boulder, CO, US | 1 | 1990 |