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Inventor

Charles R. Watt

Inventor
Longmont, CO, US

Overview

47→
Patents
1989–2013
Patent span
Physics
Primary field (CPC G)

Patents· 47 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 transducer100%
PatentTitleYear
8,565,052'Methods, systems, and computer program products for correcting repeatable runout'20138,510,766'Drum for use in testing optical tape media and method and apparatus for mounting optical tape media on drum'20138,000,049'Self-servo writing using reference patterns with timing correction'20117,782,721'Digital focus and tracking servo system with multi-zone calibration'20107,680,004'Digital servo system with inverse non-linearity compensation'20107,675,702'Reduced convolution for repetitive disturbance rejection'20107,672,199'Close focus algorithm in a digital focus servo system'20107,570,445'Adaptively adjusting seek function control parameters based on off-track write events'20097,551,387'Servo writing with offset compensation for prewritten reference'20097,260,031'Digital focus and tracking servo system with one-track jump'20077,196,979'Calibration storage methods for a digital focus and tracking servo system with calibration'20077,079,459'System and method for performing a spin motor startup operation'20067,065,018'CLV system and method using PSA lookup'20067,057,983'System and method for controlling tracking and seeking in an optical disc drive'20067,054,242'System and method for controlling focus in an optical disc drive'20067,038,988'System and method for controlling time critical operations in a control system for an optical disc drive'20067,023,776'Calibration initiation methods for a tracking and focus servo system'20067,020,054'Digital servo system with biased feed-forward'20066,977,873'System and method to adjust the level of re-calibration effort based on disc drive performance'20056,970,410'Focus detection in a digital focus servo system'20056,970,403'Calibration of tracking error signal offset in a tracking servo system'20056,963,524'System and method for controlling interrupts in a control system for an optical disc drive'20056,958,963'System and method for handling events in an optical disc drive'20056,958,957'Digital tracking and focus servo system with TES to FES crosstalk calibration'20056,950,380'Detector input dark current offset calibration in an optical disk drive digital servo'20056,937,543'Digital focus servo system with a sliding notch filter'20056,930,963'Tracking and focus servo system with head load'20056,922,380'Tracking and focus servo system with anti-skate algorithm'20056,906,985'Calibration of tracking error signal gain in a tracking servo system'20056,904,007'Digital servo system with loop gain calibration'20056,901,040'Kp and Ki lookup system and method'20056,898,170'PMAD/PSA digital feedback system'20056,891,781'Digital servo system with second order compensator'20056,891,789'Tracking and focus servo system with automatic media type detector'20056,885,619'Detector input stray light offset calibration in an optical disk drive'20056,885,620'System and method for recovering from performance errors in an optical disc drive'20056,882,601'Digital servo system with feed-forward control loops'20056,876,609'System and method for controlling a spin motor'20056,847,597'Optical disk drive with a digital focus and tracking servo system'20056,813,226'Calibration of a focus sum threshold in a focus servo system'20046,813,228'Tracking and focus servo system with direction sensor'20046,809,995'Digital focus and tracking servo system'20046,754,151'BEMF timing system'20046,741,530'Time critical and non-time critical tasks control system for an optical disk using first and second processors'20046,738,320'System and method for moving optical pick up from current position to target position with smooth control'20046,704,261'Spin motor control in an optical drive'20044,890,172'Automatic servo gain calibration system for a disk drive'1989

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989Patents assigned to DIGITAL EQUIPMENT CORP (1)· patent assignee history
1989Based in Shrewsbury, MA, US· patent location history
2004–2010Patents assigned to DPHI ACQUISITIONS INC (38)· patent assignee history
2004–2013Based in Longmont, CO, US· patent location history
2005Patents assigned to DPHI ACQUISITION INC (1)· patent assignee history
2005Patents assigned to DPHI ACQUISTIONS INC (1)· patent assignee history
2009–2011Patents assigned to SEAGATE TECHNOLOGY LLC (3)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
DPHI ACQUISITIONS INC382004–2010
SEAGATE TECHNOLOGY LLC32009–2011
DIGITAL EQUIPMENT CORP11989
DPHI ACQUISITION INC12005
DPHI ACQUISTIONS INC12005
Locations
LocationPatentsSpan
Longmont, CO, US462004–2013
Shrewsbury, Massachusetts, US11989