Patents by Inventor Richard Lyle Keizer

Richard Lyle Keizer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Reducing effect of frequency acquisition error in a position error signal responsive to split servo burst patterns
    Patent number: 9514775
    Abstract: In a servo control loop, servo burst signals that are read from a plurality of servo burst patterns that include a split servo burst pattern contain frequency acquisition error. The frequency acquisition error is at least partially removed to generate a frequency acquisition error compensated position error signal (PES).
    Type: Grant
    Filed: January 21, 2009
    Date of Patent: December 6, 2016
    Assignee: Seagate Technology LLC
    Inventors: Richard Lyle Keizer, Mustafa Can Ozturk, Puskal Prasad Pokharel
  • Phase detector that compensates for frequency variation induced bias in phases of servo burst fields
    Patent number: 7880992
    Abstract: In a servo control loop, phase detection between a clock signal and servo burst fields on a movable storage media is carried out with compensation for the effects of frequency variation in the timing of servo burst fields.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: February 1, 2011
    Assignee: Seagate Technology LLC
    Inventors: Mustafa Can Ozturk, Richard Lyle Keizer, Puskal Prasad Pokharel
  • Deterministic phase mismatch correction in servo position estimation systems
    Patent number: 7859778
    Abstract: A method includes estimating a phase difference between components of a position signal in a servo position estimation system, and correcting the phase difference of the components of the position signal to provide a phase-compensated position signal.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: December 28, 2010
    Assignee: Seagate Technology LLC
    Inventors: Barmeshwar Vikramaditya, Patrick John Korkowski, Richard Lyle Keizer
  • REDUCING EFFECT OF FREQUENCY ACQUISITION ERROR IN A POSITION ERROR SIGNAL RESPONSIVE TO SPLIT SERVO BURST PATTERNS
    Publication number: 20100128386
    Abstract: In a servo control loop, servo burst signals that are read from a plurality of servo burst patterns that include a split servo burst pattern contain frequency acquisition error. The frequency acquisition error is at least partially removed to generate a frequency acquisition error compensated position error signal (PES).
    Type: Application
    Filed: January 21, 2009
    Publication date: May 27, 2010
    Inventors: Richard Lyle Keizer, Mustafa Can Ozturk, Puskal Prasad Pokharel
  • PHASE DETECTOR THAT COMPENSATES FOR FREQUENCY VARIATION INDUCED BIAS IN PHASES OF SERVO BURST FIELDS
    Publication number: 20100053800
    Abstract: In a servo control loop, phase detection between a clock signal and servo burst fields on a movable storage media is carried out with compensation for the effects of frequency variation in the timing of servo burst fields.
    Type: Application
    Filed: October 30, 2008
    Publication date: March 4, 2010
    Inventors: Mustafa Can Ozturk, Richard Lyle Keizer, Puskal Prasad Pokharel
  • Utilizing track identification fields for timing recovery
    Patent number: 7349167
    Abstract: An apparatus comprises a data storage medium having a plurality of servo sectors and a plurality of data sectors, wherein each of the servo sectors includes a phase locked loop field and a track identification field, a controller for controlling the position of a recording head with respect to the data storage medium, and a servo demodulator for recovering timing information from both the phase locked loop field and the track identification field, and for producing a timing estimate. The method performed by the apparatus is also included.
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: March 25, 2008
    Assignee: Seagate Technology LLC
    Inventors: Mehmet Fatih Erden, Richard Lyle Keizer, Timothy Francis Ellis, Alexei Hiram Sacks