Inventor · disambiguated record
David L. Schell
Also filed as: SCHELL DAVID L · SCHELL DAVID LOUIS
40 granted patents·1,374 citations·filing 1986–2013
98Inventor score
Files withDISCOVISION ASS20SEAGATE TECHNOLOGY LLC7LASER MAGNETIC STORAGE INT6LSI LOGIC CORP5APPLIED MAGNETICS CORP2
Top patents by PatentIndex Score
40 records- 0198US5875158AServo control system for information storage deviceDISCOVISION ASS·Filed 1998·Granted Feb 23, 1999·121 cites·12 claims
- 0297US5729511AOptical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signalDISCOVISION ASS·Filed 1995·Granted Mar 17, 1998·124 cites·44 claims
- 0396US6986098B2Method of reducing miscorrections in a post-processor using column parity checksLSI LOGIC CORP·Filed 2001·Granted Jan 10, 2006·201 cites·18 claims
- 0496US6122232AIsolation apparatus for use in disc drive system to mitigate effects of undesired mechanical forces and disc drive system including sameDISCOVISION ASS·Filed 1998·Granted Sep 19, 2000·88 cites·30 claims
- 0596US6087644AFocus capture for optical disc system including detection of quad sum signal to close focusDISCOVISION ASS·Filed 1997·Granted Jul 11, 2000·73 cites·12 claims
- 0696US5136558ATwo axis electromagnetic actuatorAPPLIED MAGNETICS CORP·Filed 1989·Granted Aug 4, 1992·71 cites·39 claims
- 0794US5313332AFlexure suspension for two axis actuatorAPPLIED MAGNETICS CORP·Filed 1993·Granted May 17, 1994·78 cites·19 claims
- 0893US5878015ALaser driver for controlling electrical current passed to a laser in an optical disc systemDISCOVISION ASS·Filed 1995·Granted Mar 2, 1999·47 cites·11 claims
- 0992US5748578AColpitts type oscillator having reduced ringing and improved optical disc system utilizing sameDISCOVISION ASS·Filed 1995·Granted May 5, 1998·70 cites·63 claims
- 1090US4907212AMethod and apparatus for calibrating an optical disk systemLASER MAGNETIC STORAGE INT·Filed 1988·Granted Mar 6, 1990·44 cites·29 claims
- 1185US6418097B1Analog to digital converter assembly for normalizing servo error signals and multiplexing reference voltage inputs and digital outputs and improved optical drive system including sameDISCOVISION ASS·Filed 1995·Granted Jul 9, 2002·26 cites·82 claims
- 1285US6266306B1Analog to digital converter and assembly for use in optical drive system to normalize servo error signals and multiplex reference voltage inputs and digital outputsDISCOVISION ASS·Filed 1997·Granted Jul 24, 2001·24 cites·22 claims
- 1384US6278665B1Optical disc system including current monitoring circuit assembly having controller with improved optics module and laser driver and method for operating sameDISCOVISION ASS·Filed 1997·Granted Aug 21, 2001·22 cites·7 claims
- 1484US5796703AApparatus for controlling an electrical current passed to a writing device in an optical storage systemDISCOVISION ASS·Filed 1995·Granted Aug 18, 1998·23 cites·8 claims
- 1583US6434087B1Optical disc system and method for controlling bias coil and light source to process information on a storage mediumDISCOVISION ASS·Filed 1995·Granted Aug 13, 2002·41 cites·15 claims
- 1683US6069857AOptical disc system having improved circuitry for performing blank sector check on readable discDISCOVISION ASS·Filed 1997·Granted May 30, 2000·39 cites·66 claims
- 1783US4779253ASampled servo for an optical disk driveLASER MAGNETIC STORAGE INT·Filed 1986·Granted Oct 18, 1988·27 cites·22 claims
- 1881US6566922B1Zero phase and frequency restart PLLLSI LOGIC CORP·Filed 2001·Granted May 20, 2003·15 cites·18 claims
- 1980US6317391B1Optical disc system having current monitoring circuit with improved bias coil assembly and controller for laser driver and method for operating sameDISCOVISION ASS·Filed 1997·Granted Nov 13, 2001·17 cites·9 claims
- 2080US5920539AApparatus and method for suppression of electromagnetic emissions having a groove on an external surface for passing an electrical conductorDISCOVISION ASS·Filed 1995·Granted Jul 6, 1999·34 cites·20 claims
- 2179US6243336B1Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal and focus capture method for use in sameDISCOVISION ASS·Filed 1998·Granted Jun 5, 2001·17 cites·81 claims
- 2276US7843661B2Controller with fractional position algorithmSEAGATE TECHNOLOGY LLC·Filed 2005·Granted Nov 30, 2010·3 cites·20 claims
- 2376US6058081AOptical drive system having servomotor operated relative to maximum quad sum signalDISCOVISION ASS·Filed 1995·Granted May 2, 2000·15 cites·52 claims
- 2476US4855977ATrack seeking apparatus and method using sampled informationLASER MAGNETIC STORAGE INT·Filed 1987·Granted Aug 8, 1989·20 cites·44 claims
- 2575US6586968B1Programmable bit ordering for serial portLSI LOGIC CORP·Filed 2001·Granted Jul 1, 2003·22 cites·18 claims
- 2669US5828054AFocusing method and system for focus capture and focus control in optical disc system including detection of Quad Sum signal to close focusDISCOVISION ASS·Filed 1995·Granted Oct 27, 1998·10 cites·89 claims
- 2767US6967807B2Selecting physical cylinders in a disc drive employing discs with pre-written servo patternsSEAGATE TECHNOLOGY LLC·Filed 2003·Granted Nov 22, 2005·7 cites·42 claims
- 2867US6236625B1Optical disc system having current monitoring circuit with controller for laser driver and method for operating sameDISCOVISION ASS·Filed 1997·Granted May 22, 2001·20 cites·18 claims
- 2962US4914645AOptical disk tracking and seeking systems and specific track formats using servo areasLASER MAGNETIC STORAGE INT·Filed 1988·Granted Apr 3, 1990·14 cites·14 claims
- 3061US6927932B1Filter for disk drive bi-phase servo demodulationLSI LOGIC CORP·Filed 2001·Granted Aug 9, 2005·4 cites·26 claims
- 3161US4864552ADriving signal for coarse servo employing sampled offset signalLASER MAGNETIC STORAGE INT·Filed 1986·Granted Sep 5, 1989·12 cites·28 claims
- 3260US6091684AOptical disc system and method for changing the rotational rate of an information storage mediumDISCOVISION ASS·Filed 1995·Granted Jul 18, 2000·14 cites·37 claims
- 3359US6233210B1Optical drive error tracking method and apparatusLSI LOGIC CORP·Filed 1998·Granted May 15, 2001·13 cites·25 claims
- 3456US7477476B2Trajectory control profile with non-zero initial velocitySEAGATE TECHNOLOGY LLC·Filed 2007·Granted Jan 13, 2009·0 cites·20 claims
- 3556US6034364AOptical disc system including focus capture assembly with focus error signal circuit and method for operating sameDISCOVISION ASS·Filed 1997·Granted Mar 7, 2000·5 cites·34 claims
- 3653US7554761B2Open loop Ka calibration with low frequency compensationSEAGATE TECHNOLOGY LLC·Filed 2007·Granted Jun 30, 2009·0 cites·18 claims
- 3753US7092184B2Monitoring a sensor's output using a target window that is based on a longitudinal offset's position-dependent indicatorSEAGATE TECHNOLOGY LLC·Filed 2003·Granted Aug 15, 2006·2 cites·29 claims
- 3853US4718054AServo error write blanking circuit for an optical recording diskLASER MAGNETIC STORAGE INT·Filed 1986·Granted Jan 5, 1988·9 cites·7 claims
- 3952US8891200B1Impedance mitigation of a microactuator conductive jointSEAGATE TECHNOLOGY LLC·Filed 2013·Granted Nov 18, 2014·0 cites·20 claims
- 4049US6917485B2Dynamic head switch timing recalibration apparatus and methodSEAGATE TECHNOLOGY LLC·Filed 2003·Granted Jul 12, 2005·2 cites·16 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →