Inventor
John Contreras
Inventor
Palo Alto, CA, US
Overview
Patents· 100 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 transducer65%
H05KPrinted circuits6%
H01PWaveguides4%
G11CStatic stores3%
H03KPulse technique3%
H10WGeneric packages, interconnections, connectors or other constructional details of devices covered by class h103%
G01RMeasuring electric variables2%
H01LSemiconductor devices2%
H03FAmplifiers2%
B82YSpecific uses or applications of nanostructures1%
PatentTitleYear
11,087,784Data storage devices with integrated slider voltage potential control202110,950,265Data storage device configured with manufacture PCB for concurrent write/read operation202110,896,695Data storage device comprising dual channel preamp circuit202110,891,973High-bandwidth STO bias architecture with integrated slider voltage potential control202110,650,850Hard disk drive with write gap conductive structure and dual independent interface voltage control circuitry202010,643,676Series resistance in transmission lines for die-to-die communication202010,637,533Dedicated termination dies for memory systems202010,629,229High-bandwidth STO bias architecture with integrated slider voltage potential control202010,564,053HAMR thermal sensor with fast response time202010,468,073Transmission line optimization for multi-die systems201910,461,965Active low-power termination201910,424,323High-bandwidth STO bias architecture with integrated slider voltage potential control201910,411,670Compact broadband common-mode filter201910,285,259Solenoid filter built into a printed circuit board201910,283,150Suspension adjacent-conductors differential-signal-coupling attenuation structures201910,244,618Patterned ground structure filter designs with improved performance201910,175,122HAMR thermal sensor with fast response time201910,056,098Data storage device employing multi-mode sensing circuitry for multiple head sensor elements20189,837,106Two-dimensional magnetic recording (TDMR) disk drive with multiple sensors and circuitry for selection of an active pair of associated amplifiers20179,717,140'Shielded patterned ground structure filter for EMI reduction'20179,570,096'Read path compensation for SNR and signal transfer'20179,564,163'Implementing dual partially independent thermal flyheight control (TFC) for hard disk drives'20179,280,993'Implementing asymmetric degauss control for write head for hard disk drives'20169,275,656'Disk drive with channel and preamp with dynamic write-current control for write head'20169,275,664'Shielded flex cable for use in a disk drive'20169,218,822'Disk drive with preamplifier with isolation for multiple readers in a slider with a common return signal'20159,196,266'Integrated lead suspension (ILS) for two-dimensional magnetic recording (TDMR) disk drive'20159,165,596'Magnetic recording disk drive with multiple preamplifiers and common transmission line with impedance compensation'20159,153,248'Hard disk drive preamplifier with write driver having bypass current sources for compensation of write head magnetic asymmetry'20159,129,660'Transducer resistor shunt structure for low-cost probing'20159,117,469'Suspension design with split substrate for improved interference signal immunity'20159,117,474'Implementing write head device for contact detection and spacing sensing'20159,111,561'Magnetic recording disk drive with write current overshoot amplitude (OSA) responsive to data transitions'20159,099,128'Implementing noise based detection of spin torque oscillator power-on in microwave-assisted magnetic recording (MAMR) hard disk drives'20159,047,926'Dual thermal sensor for HAMR waveguide power monitor and integration with the contact sensor'20159,036,305'Magnetic recording disk drive with write driver to write head transmission line with multiple segments having different numbers of conductive traces'20159,036,306'Grounding for a hard disk drive suspension tail'20159,030,770'Programmable analog feed-forward timer for dynamic wave shaping'20159,001,444'Implementing spin torque oscillator power-on oscillation checker for microwave-assisted magnetic recording hard disk drives'20158,988,829'Disk drive with preamplifier for multiple readers in a slider with a common return signal'20158,982,504'Implementing calibration of cooling sensitivity of embedded contact sensor (ECS) signal using thermal fly-height control (TFC) actuations'20158,917,465'Implementing spin torque oscillator power-on oscillation checker using ramped STO bias differentiator in microwave-assisted magnetic recording (MAMR) hard disk drives'20148,891,189'Disk drive with filter compensation integrated in sliders for high-bandwidth read sensors'20148,842,383'Laser power sensor with dual temperature sensor'20148,830,614'Balanced embedded contact sensor with low noise architecture'20148,824,077'Perpendicular magnetic recording write head with ladder network compensation circuitry on slider body for write current overshoot at write current switching'20148,824,091'Media topography driven flying height modulation sensing using embedded contact sensor'20148,804,263'DC-offset adjustment for balanced embedded contact sensor'20148,730,607'Thermoelectric voltage-based differential contact sensor'20148,724,249'Disk drive with multiplexed read signal and fly-height signal for fly-height monitoring during writing'20148,705,323'TAR temperature sensor having faster response time'20148,675,311'Interleaved conductor structure with wrap around traces'20148,599,506'Integrating control of slider bias potential, touch-down detection and fly-height determination in a HDD'20138,598,460'Interleaved conductor structure with offset traces'20138,570,684'Implementing integrated spin-torque oscillator and interface bias control for hard disk drives'20138,553,506'Preheat feature for thermally assisted recording'20138,531,800'Magnetic write head having dual parallel capacitors for integrated transmission line compensation'20138,503,125'Channel-source laser-pulsing system architecture for thermal-assisted recording'20138,482,872'Distributed temperature detector architecture for head disk interface systems'20138,446,690'Perpendicular magnetic recording write head with spin torque oscillator for fast switching of write pole magnetization'20138,351,155'Perpendicular magnetic recording system with spin torque oscillator and control circuitry for fast switching of write pole magnetization'20138,310,789'Conductor suspension structure and electrical connection assembly for transmitting complementary signals in a hard disk drive'20128,310,902'Signal-extraction laser-pulse system architecture for thermally-assisted magnetic recording'20128,305,712'Tunable microstrip signal transmission path in a hard disk drive'20128,274,756'Use of carbon nanotubes to form conductive gaskets deployed in sensitive environments'20128,233,240'Magnetic recording disk drive with integrated lead suspension having multiple segments for optimal characteristic impedance'20128,189,281'Magnetic recording disk drive with write driver to write head transmission line having non-uniform sections for optimal write current pulse overshoot'20128,179,633'Perpendicular magnetic recording system and write head with transverse auxiliary pole for fast switching of write pole magnetization'20128,174,788'Motor mount for interference suppression in a hard disk drive'20128,154,827'Integrated lead suspension with multiple crossover coplanar connection of the electrically conductive traces'20128,139,319'Perpendicular magnetic recording system with magnetic precession for fast switching of perpendicular write pole magnetization'20128,116,031'Perpendicular magnetic recording system with helical write coil and auxiliary coil for fast switching of write pole magnetization'20128,116,032'Perpendicular magnetic recording system with auxiliary coil and circuitry for fast switching of write pole magnetization'20128,107,177'Electrical interconnect system with integrated transmission- line compensation components'20128,098,450'Fly-height management in a hard disk drive (HDD)'20128,081,399'Perpendicular magnetic recording write head with enhancement capacitor on slider body for write current overshoot at write current switching'20118,049,984'Integrated slider bias control'20118,045,297'Flex cable and method for lowering flex cable impedance'20117,830,634'Head-disk contact detection and work function difference determination'20107,786,754'High speed digital signaling apparatus and method using reflected signals to increase total delivered current'20107,667,914'Direct coupled wide-bandwidth front-end with smart bias control amplifier'20107,660,068'Method and system for pre-contact detection and active damping of air bearing vibrations in a hard disk drive'20107,619,843'Write through drivers for disk drive systems'20097,545,608'Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with impedance adjustment'20097,489,479'Electrical lead suspension having partitioned air slots'20097,417,209'Recording disk drive with reduced noise thermal flyheight control'20087,352,535'Method and apparatus for reducing crosstalk and signal loss in flexing interconnects of an electrical lead suspension'20087,177,107'Preamplifier circuit with signal interference cancellation suitable for use in magnetic storage devices'20076,822,817'Preamplifier circuit suitable for use in magnetic storage devices'20046,420,910'Quasi-current sensing input impedance controlled preamplifier for magnetoresistive elements'20026,356,113'Recording channel with voltage-type write driver for use with transmission-line interconnect'20026,340,882'Accurate current source with an adjustable temperature dependence circuit'20026,201,653'By-pass write drivers for high-performance data recording'20016,181,527'Transducer suspension system including a frequency dependent shunt'20016,014,281'Using a read element and a read/write coupling path to detect write-safe conditions'20005,969,523'Preamplifier bias mode to re-initialize a GMR head after losing initialization'19995,822,141'High speed FET write driver for an inductive head'19985,774,291'Voltage measurement circuit for a magnetoresistive head installed in a disk enclosure'19985,323,278'Low noise amplifier circuit for magnetoresistive sensors for fast read-write switching in low supply voltage applications'19945,296,975'High-transition-rate, low-supply-voltage write driver circuitry for magnetic inductive write head'1994Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1994–2004Patents assigned to IBM (12)· patent assignee history
1994–2020Based in San Jose, CA, US· patent location history
2007–2021Based in Palo Alto, CA, US· patent location history
2011–2014Patents assigned to CONTRERAS JOHN THOMAS (16)· patent assignee history
2011–2013Patents assigned to HITACHI GLOBAL STORAGE TECH NL (16)· patent assignee history
2012–2019Patents assigned to HGST Netherlands BV (43)· patent assignee history
2017–2021Patents assigned to WESTERN DIGITAL TECH INC (20)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HGST Netherlands BV | 43 | 2012–2019 |
| WESTERN DIGITAL TECH INC | 20 | 2017–2021 |
| CONTRERAS JOHN THOMASself | 16 | 2011–2014 |
| HITACHI GLOBAL STORAGE TECH NL | 16 | 2011–2013 |
| IBM | 12 | 1994–2004 |
Locations
| Location | Patents | Span |
|---|---|---|
| Palo Alto, California, US | 86 | 2007–2021 |
| San Jose, California, US | 14 | 1994–2020 |