Inventor · disambiguated record
Mark David Hagen
Also filed as: HAGEN MARK · HAGEN MARK D · HAGEN MARK DAVID
31 granted patents·4 pending applications·2,160 citations·filing 1982–2019
98Inventor score
Files withTEXAS INSTRUMENTS INC14IBM6WESTERN DIGITAL TECH INC5WESTERN DIGITAL CORP4OETTINGER ERIC GREGORY2
Top patents by PatentIndex Score
35 records- 0199US7126776B1Disk drive having a sector clock that is synchronized to the angular speed of the spindle motorWESTERN DIGITAL TECH INC·Filed 2002·Granted Oct 24, 2006·218 cites·2 claims
- 0298US7205749B2Power line communication using power factor correction circuitsTEXAS INSTRUMENTS INC·Filed 2005·Granted Apr 17, 2007·299 cites·8 claims
- 0397US7688608B2Reference voltage change in a digital power supplyTEXAS INSTRUMENTS INC·Filed 2007·Granted Mar 30, 2010·54 cites·20 claims
- 0497US6603622B1Disk drive employing a sync mark detector comprising a matched filter and a dual polarity correlatorWESTERN DIGITAL TECH INC·Filed 2001·Granted Aug 5, 2003·243 cites·4 claims
- 0596US6639748B1Disk drive that discerns the polarity of a head signal from a sync mark to enhance data detectionWESTERN DIGITAL TECH INC·Filed 2001·Granted Oct 28, 2003·152 cites·12 claims
- 0696US6369969B1Disk drive for detecting a polarity error of a magnetoresistive head by detecting a sync markWESTERN DIGITAL TECH INC·Filed 2001·Granted Apr 9, 2002·158 cites·6 claims
- 0796US6249393B1Disk drive having a write condition detector for suspending write operations while a transducer flying height deviates from its operating flying heightWESTERN DIGITAL CORP·Filed 1998·Granted Jun 19, 2001·193 cites·23 claims
- 0894US7919958B2Methods and apparatus for controlling a digital power supplyTEXAS INSTRUMENTS INC·Filed 2007·Granted Apr 5, 2011·30 cites·20 claims
- 0994US6369974B1Disk drive with method of constructing a continuous position signal and constrained method of linearizing such position signal while maintaining continuityWESTERN DIGITAL TECH INC·Filed 1999·Granted Apr 9, 2002·152 cites·16 claims
- 1094US6052250ADisk drive with separately determined servo and data track pitchWESTERN DIGITAL CORP·Filed 1997·Granted Apr 18, 2000·164 cites·1 claims
- 1191US4542377ARotatable display work stationIBM·Filed 1982·Granted Sep 17, 1985·82 cites·5 claims
- 1290US6078453AMethod and apparatus for optimizing the servo read channel of a hard disk driveWESTERN DIGITAL CORP·Filed 1997·Granted Jun 20, 2000·128 cites·21 claims
- 1385US7903439B2Methods and apparatus to control a digital power supplyTEXAS INSTRUMENTS INC·Filed 2007·Granted Mar 8, 2011·14 cites·20 claims
- 1485US5982173AMethod of characterizing and compensating for read head nonlinearity in a disk driveWESTERN DIGITAL CORP·Filed 1998·Granted Nov 9, 1999·46 cites·17 claims
- 1584US8278898B2Auto-tuning power supplyDAVOUDI ALI·Filed 2010·Granted Oct 2, 2012·15 cites·20 claims
- 1683US5241433ADisk drive servo controlIBM·Filed 1992·Granted Aug 31, 1993·41 cites·13 claims
- 1781US7787263B2Methods and apparatus to control a digital power supplyTEXAS INSTRUMENTS INC·Filed 2007·Granted Aug 31, 2010·11 cites·20 claims
- 1881US6812669B2Resonant scanning mirror driver circuitTEXAS INSTRUMENTS INC·Filed 2002·Granted Nov 2, 2004·24 cites·14 claims
- 1978US5682274AMethod and apparatus for positioning transducers to correct for read and write element misregistration offsets which vary dependent on rotary actuator angular position across a disk mediumIBM·Filed 1995·Granted Oct 28, 1997·34 cites·18 claims
- 2077US7352691B2Double difference phase detectionTEXAS INSTRUMENTS INC·Filed 2004·Granted Apr 1, 2008·25 cites·29 claims
- 2174US7088070B2Resonant scanning mirror driver circuitTEXAS INSTRUMENTS INC·Filed 2005·Granted Aug 8, 2006·6 cites·17 claims
- 2273US6915080B2Method and apparatus for aligning optical wireless linksFiled 2001·Granted Jul 5, 2005·18 cites·26 claims
- 2369US5790341AMethod and apparatus for reducing servo interference in a magneto-resistive head using skew between head and servo patternIBM·Filed 1995·Granted Aug 4, 1998·22 cites·25 claims
- 2464US8477879B2System and method for bi-phase modulation decodingOETTINGER ERIC GREGORY·Filed 2010·Granted Jul 2, 2013·2 cites·17 claims
- 2563US2020112249A1Methods and apparatus to measure a transfer function of a control systemTEXAS INSTRUMENTS INC·Filed 2019·Application pending·0 cites
- 2661US7389052B2Calibration method for station orientationTEXAS INSTRUMENTS INC·Filed 2002·Granted Jun 17, 2008·6 cites·12 claims
- 2760US6956350B2Resonant scanning mirror driver circuitTEXAS INSTRUMENTS INC·Filed 2004·Granted Oct 18, 2005·6 cites·17 claims
- 2854US8760081B2Systems and methods for backlight drivingHAGEN MARK D·Filed 2006·Granted Jun 24, 2014·1 cites·13 claims
- 2949US6714338B2MEM's mirror internal sensor linearization based on driver linearityTEXAS INSTRUMENTS INC·Filed 2002·Granted Mar 30, 2004·2 cites·10 claims
- 3046US6219197B1Method and apparatus for servo positioning in a direct access storage device with a transducer read element width greater than ⅓ and less than ½ width of a data cylinderIBM·Filed 1996·Granted Apr 17, 2001·7 cites·7 claims
- 3145US6426844B1Method and apparatus for phase modulated servo positioning in a direct access storage deviceIBM·Filed 1995·Granted Jul 30, 2002·7 cites·10 claims
- 3245US2007182342A1Lcd backlight driverTEXAS INSTRUMENTS INC·Filed 2006·Application pending·0 cites
- 3342US7215888B2System and method of implementing variable loop gain in an optical wireless link based on distanceTEXAS INSTRUMENTS INC·Filed 2002·Granted May 8, 2007·0 cites·15 claims
- 3438US2011158329A1System and method for bi-phase modulation decodingOETTINGER ERIC GREGORY·Filed 2011·Application pending·0 cites
- 3537US2004208611A1Method of preventing reflections in an optical wireless linkFiled 2002·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →