Inventor · disambiguated record

Charles R. Watt

Also filed as: WATT CHARLES R · WATT JR CHARLES R

47 granted patents·3 pending applications·460 citations·filing 1988–2012

98Inventor score

Technology areasG11B B24B

Files withDPHI ACQUISITIONS INC38 SEAGATE TECHNOLOGY LLC3 DIGITAL EQUIPMENT CORP1 DPHI ACQUISITION INC1 DPHI ACQUISTIONS INC1

Top patents by PatentIndex Score

50 records

0194US7551387B2Servo writing with offset compensation for prewritten referenceMAXTOR CORP·Filed 2007·Granted Jun 23, 2009·26 cites·22 claims
0293US7570445B2Adaptively adjusting seek function control parameters based on off-track write eventsSEAGATE TECHNOLOGY LLC·Filed 2007·Granted Aug 4, 2009·17 cites·29 claims
0393US7196979B2Calibration storage methods for a digital focus and tracking servo system with calibrationDPHI ACQUISITIONS INC·Filed 2001·Granted Mar 27, 2007·39 cites·18 claims
0492US4890172AAutomatic servo gain calibration system for a disk driveDIGITAL EQUIPMENT CORP·Filed 1988·Granted Dec 26, 1989·82 cites·11 claims
0589US6754151B2BEMF timing systemDPHI ACQUISITIONS INC·Filed 2001·Granted Jun 22, 2004·26 cites·3 claims
0688US6809995B2Digital focus and tracking servo systemDPHI ACQUISITIONS INC·Filed 2001·Granted Oct 26, 2004·23 cites·21 claims
0787US7675702B2Reduced convolution for repetitive disturbance rejectionSEAGATE TECHNOLOGY LLC·Filed 2007·Granted Mar 9, 2010·8 cites·20 claims
0887US7020054B2Digital servo system with biased feed-forwardDPHI ACQUISITIONS INC·Filed 2001·Granted Mar 28, 2006·23 cites·14 claims
0983US6813226B2Calibration of a focus sum threshold in a focus servo systemDPHI ACQUISITIONS INC·Filed 2001·Granted Nov 2, 2004·16 cites·14 claims
1081US8000049B2Self-servo writing using reference patterns with timing correctionSEAGATE TECHNOLOGY LLC·Filed 2007·Granted Aug 16, 2011·4 cites·17 claims
1181US6906985B2Calibration of tracking error signal gain in a tracking servo systemDPHI ACQUISITIONS INC·Filed 2001·Granted Jun 14, 2005·14 cites·19 claims
1280US6970403B2Calibration of tracking error signal offset in a tracking servo systemDPHI ACQUISITION INC·Filed 2001·Granted Nov 29, 2005·18 cites·11 claims
1380US6958957B2Digital tracking and focus servo system with TES to FES crosstalk calibrationDPHI ACQUISITIONS INC·Filed 2001·Granted Oct 25, 2005·14 cites·11 claims
1477US7023776B2Calibration initiation methods for a tracking and focus servo systemDPHI ACQUISITIONS INC·Filed 2001·Granted Apr 4, 2006·11 cites·24 claims
1575US7079459B2System and method for performing a spin motor startup operationDPHI ACQUISITIONS INC·Filed 2001·Granted Jul 18, 2006·10 cites·4 claims
1675US6904007B2Digital servo system with loop gain calibrationDPHI ACQUISITIONS INC·Filed 2001·Granted Jun 7, 2005·10 cites·16 claims
1775US6891781B2Digital servo system with second order compensatorDPHI ACQUISITIONS INC·Filed 2001·Granted May 10, 2005·10 cites·15 claims
1874US6885619B2Detector input stray light offset calibration in an optical disk driveDPHI ACQUISITIONS INC·Filed 2001·Granted Apr 26, 2005·9 cites·25 claims
1973US6741530B2Time critical and non-time critical tasks control system for an optical disk using first and second processorsDPHI ACQUISITIONS INC·Filed 2001·Granted May 25, 2004·9 cites·29 claims
2070US6950380B2Detector input dark current offset calibration in an optical disk drive digital servoDPHI ACQUISITIONS INC·Filed 2001·Granted Sep 27, 2005·7 cites·10 claims
2170US6937543B2Digital focus servo system with a sliding notch filterDPHI ACQUISITIONS INC·Filed 2001·Granted Aug 30, 2005·7 cites·6 claims
2269US7782721B2Digital focus and tracking servo system with multi-zone calibrationDPHI ACQUISITIONS INC·Filed 2001·Granted Aug 24, 2010·7 cites·11 claims
2368US6704261B2Spin motor control in an optical driveDPHI ACQUISITIONS INC·Filed 2001·Granted Mar 9, 2004·6 cites·8 claims
2467US7260031B2Digital focus and tracking servo system with one-track jumpDPHI ACQUISITIONS INC·Filed 2001·Granted Aug 21, 2007·6 cites·17 claims
2567US6970410B2Focus detection in a digital focus servo systemDPHI ACQUISITIONS INC·Filed 2001·Granted Nov 29, 2005·6 cites·6 claims
2667US6882601B2Digital servo system with feed-forward control loopsDPHI ACQUISITIONS INC·Filed 2001·Granted Apr 19, 2005·6 cites·18 claims
2766US6847597B2Optical disk drive with a digital focus and tracking servo systemDPHI ACQUISITIONS INC·Filed 2001·Granted Jan 25, 2005·6 cites·18 claims
2864US7680004B2Digital servo system with inverse non-linearity compensationDPHI ACQUISITIONS INC·Filed 2001·Granted Mar 16, 2010·5 cites·3 claims
2961US6891789B2Tracking and focus servo system with automatic media type detectorDPHI ACQUISITIONS INC·Filed 2001·Granted May 10, 2005·4 cites·6 claims
3061US6813228B2Tracking and focus servo system with direction sensorDPHI ACQUISITIONS INC·Filed 2001·Granted Nov 2, 2004·4 cites·18 claims
3160US7038988B2System and method for controlling time critical operations in a control system for an optical disc driveDPHI ACQUISITIONS INC·Filed 2001·Granted May 2, 2006·4 cites·15 claims
3260US6901040B2Kp and Ki lookup system and methodDPHI ACQUISITIONS INC·Filed 2001·Granted May 31, 2005·3 cites·15 claims
3359US6885620B2System and method for recovering from performance errors in an optical disc driveDPHI ACQUISITIONS INC·Filed 2001·Granted Apr 26, 2005·3 cites·32 claims
3458US6977873B2System and method to adjust the level of re-calibration effort based on disc drive performanceDPHI ACQUISITIONS INC·Filed 2001·Granted Dec 20, 2005·3 cites·26 claims
3555US7057983B2System and method for controlling tracking and seeking in an optical disc driveDPHI ACQUISITIONS INC·Filed 2001·Granted Jun 6, 2006·2 cites·36 claims
3655US7054242B2System and method for controlling focus in an optical disc driveDPHI ACQUISITIONS INC·Filed 2001·Granted May 30, 2006·2 cites·4 claims
3755US6738320B2System and method for moving optical pick up from current position to target position with smooth controlDPHI ACQUISITIONS INC·Filed 2001·Granted May 18, 2004·2 cites·8 claims
3853US6930963B2Tracking and focus servo system with head loadDPHI ACQUISTIONS INC·Filed 2001·Granted Aug 16, 2005·3 cites·19 claims
3952US7065018B2CLV system and method using PSA lookupDPHI ACQUISITIONS INC·Filed 2001·Granted Jun 20, 2006·1 cites·17 claims
4051US7672199B2Close focus algorithm in a digital focus servo systemDPHI ACQUISITIONS INC·Filed 2001·Granted Mar 2, 2010·1 cites·8 claims
4151US6963524B2System and method for controlling interrupts in a control system for an optical disc driveDPHI ACQUISITIONS INC·Filed 2001·Granted Nov 8, 2005·1 cites·53 claims
4251US6958963B2System and method for handling events in an optical disc driveDPHI ACQUISITIONS INC·Filed 2001·Granted Oct 25, 2005·1 cites·32 claims
4351US6922380B2Tracking and focus servo system with anti-skate algorithmDPHI ACQUISITIONS INC·Filed 2001·Granted Jul 26, 2005·1 cites·11 claims
4448US8510766B2Drum for use in testing optical tape media and method and apparatus for mounting optical tape media on drumMAHNAD FARAMARZ·Filed 2011·Granted Aug 13, 2013·0 cites·20 claims
4543US6898170B2PMAD/PSA digital feedback systemDPHI ACQUISITIONS INC·Filed 2001·Granted May 24, 2005·0 cites·12 claims
4642US6876609B2System and method for controlling a spin motorDPHI ACQUISITIONS INC·Filed 2001·Granted Apr 5, 2005·0 cites·5 claims
4739US2002131354A1System and method for controlling laser power in an optical disc driveFiled 2001·Application pending·0 cites
4837US2002131338A1System and method for controlling operation of a disc drive for optical media with premastered and read/write sectorsFiled 2001·Application pending·0 cites
4937US2002080698A1System and method for controlling spin speed of media in an optical disc driveFiled 2001·Application pending·0 cites
5036US8565052B2Methods, systems, and computer program products for correcting repeatable runoutHANSEN FRED R·Filed 2012·Granted Oct 22, 2013·0 cites·24 claims

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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →