Patents by Inventor James C. Alexander

James C. Alexander 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).

  • Patent number: 10528265
    Abstract: A data storage system includes a plurality of Data Storage Devices (DSDs). A write command is sent to each DSD of the plurality of DSDs to each store one or more erasure coded shards of an overprovisioned number of shards. The overprovisioned number of shards is generated from an erasure coding on data to provide at least a predetermined level of data reliability. Write complete indications are received for a threshold number of shards less than the overprovisioned number of shards, with each write complete indication indicating that one or more shards of the overprovisioned number of shards has been stored in a DSD. It is determined that the data has been written with at least the predetermined level of data reliability after receiving write complete indications for the threshold number of shards, but before receiving write complete indications for all of the overprovisioned number of shards.
    Type: Grant
    Filed: September 3, 2016
    Date of Patent: January 7, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: James N. Malina, Kent Anderson, James C. Alexander
  • Patent number: 10372344
    Abstract: A collective latency indicator is determined that is associated with a latency in retrieving multiple erasure coded shards generated from an erasure coding on initial data. The collective latency indicator is compared to a latency limit, and a number of erasure coded shards to retrieve is adjusted based on the comparison of the collective latency indicator to the latency limit.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: August 6, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: James N. Malina, Robert L. Horn, Kent Anderson, James C. Alexander, Albert H. Chen
  • Patent number: 10374634
    Abstract: An individual latency indicator is determined for each Data Storage Device (DSD) or memory portion of a DSD storing one or more erasure coded shards generated from an erasure coding on initial data. Each individual latency indicator is associated with a latency in retrieving an erasure coded shard stored in a respective DSD or memory portion. At least one collective latency indicator is determined using determined individual latency indicators, with the at least one collective latency indicator being associated with a latency in retrieving multiple erasure coded shards. The at least one collective latency indicator is compared to a latency limit, and a subset of erasure coded shards is selected to retrieve based on the comparison of the at least one collective latency indicator to the latency limit.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: August 6, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: James N. Malina, Robert L. Horn, Kent Anderson, James C. Alexander, Albert H. Chen
  • Publication number: 20180163862
    Abstract: Systems and methods for use in controlling a hydraulically powered AC generator are provided. One control system includes a valve system. The valve system includes a fixed valve configured to provide a substantially constant flow rate of the fluid through the fixed valve to the hydraulically powered AC generator. The valve system further includes a variable valve configured to provide a variable flow rate of the fluid through the variable valve to the hydraulically powered AC generator. The control system further includes a sensor device configured to measure a speed of movement of a component of the hydraulically powered AC generator. The control system further includes a control circuit configured to control the variable flow rate of the variable valve based on the speed of movement of the component measured by the sensor device.
    Type: Application
    Filed: December 8, 2017
    Publication date: June 14, 2018
    Inventors: Robert E. Torney, Nick V. Halstead, Hans L. Drabek, Eric G. Bollensen, James C. Alexander, Tony Leakey, Gerald R. Williams
  • Publication number: 20180165016
    Abstract: A collective latency indicator is determined that is associated with a latency in retrieving multiple erasure coded shards generated from an erasure coding on initial data. The collective latency indicator is compared to a latency limit, and a number of erasure coded shards to retrieve is adjusted based on the comparison of the collective latency indicator to the latency limit.
    Type: Application
    Filed: December 8, 2016
    Publication date: June 14, 2018
    Inventors: James N. MALINA, Robert L. HORN, Kent ANDERSON, James C. ALEXANDER, Albert H. CHEN
  • Publication number: 20180165015
    Abstract: An individual latency indicator is determined for each Data Storage Device (DSD) or memory portion of a DSD storing one or more erasure coded shards generated from an erasure coding on initial data. Each individual latency indicator is associated with a latency in retrieving an erasure coded shard stored in a respective DSD or memory portion. At least one collective latency indicator is determined using determined individual latency indicators, with the at least one collective latency indicator being associated with a latency in retrieving multiple erasure coded shards. The at least one collective latency indicator is compared to a latency limit, and a subset of erasure coded shards is selected to retrieve based on the comparison of the at least one collective latency indicator to the latency limit.
    Type: Application
    Filed: December 8, 2016
    Publication date: June 14, 2018
    Inventors: James N. MALINA, Robert L. HORN, Kent ANDERSON, James C. ALEXANDER, Albert H. CHEN
  • Patent number: 9841101
    Abstract: Systems and methods for use in controlling a hydraulically powered AC generator are provided. One control system includes a valve system. The valve system includes a fixed valve configured to provide a substantially constant flow rate of the fluid through the fixed valve to the hydraulically powered AC generator. The valve system further includes a variable valve configured to provide a variable flow rate of the fluid through the variable valve to the hydraulically powered AC generator. The control system further includes a sensor device configured to measure a speed of movement of a component of the hydraulically powered AC generator. The control system further includes a control circuit configured to control the variable flow rate of the variable valve based on the speed of movement of the component measured by the sensor device.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: December 12, 2017
    Assignee: Cummins Power Generation IP, Inc.
    Inventors: Robert E. Torney, Nick V. Halstead, Hans L. Drabek, Eric G. Bollensen, James C. Alexander, Tony Leakey, Gerald R. Williams
  • Publication number: 20160072363
    Abstract: Systems and methods for use in controlling a hydraulically powered AC generator are provided. One control system includes a valve system. The valve system includes a fixed valve configured to provide a substantially constant flow rate of the fluid through the fixed valve to the hydraulically powered AC generator. The valve system further includes a variable valve configured to provide a variable flow rate of the fluid through the variable valve to the hydraulically powered AC generator. The control system further includes a sensor device configured to measure a speed of movement of a component of the hydraulically powered AC generator. The control system further includes a control circuit configured to control the variable flow rate of the variable valve based on the speed of movement of the component measured by the sensor device.
    Type: Application
    Filed: September 4, 2014
    Publication date: March 10, 2016
    Applicant: Cummins Power Generation IP, Inc.
    Inventors: Robert E. Torney, Nick V. Halstead, Hans L. Drabek, Eric G. Bollensen, James C. Alexander, Tony Leakey, Gerald R. Williams
  • Patent number: 8196001
    Abstract: Systems for identifying potentially erroneous and/or erased data are provided. Systems have a bit detector, an accumulator, and a data reconstruction processor. The bit detector assigns values to bits read in a data signal. The bit detector illustratively assigns multiple values to each of the bits. The accumulator accumulates a count of the multiple values assigned by the bit detector for each of the bits. The accumulator associates each bit with a particular value based at least in part on its accumulated count. The data reconstruction processor determines for each of the bits a confidence level of the particular value associated to it. The data reconstruction process sets flags for a portion of the bits. The flags identify the portion of the bits as possible erased or erroneous data. The flags are set based at least in part on the confidence levels of the portion of the bits.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: June 5, 2012
    Assignee: Seagate Technology LLC
    Inventors: Michael H. Chen, Rajita Shrestha, James C. Alexander
  • Patent number: 7891080
    Abstract: A method for detecting head-disc contact is disclosed. The method comprises locating a head including a head positioning microactuator and at least one of a read transducer and a write transducer adjacent to a disc such that the head is in communication with the disc, monitoring an output signal from the head positioning microactuator of the head, and evaluating the output signal to determine if the head contacts the disc.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: February 22, 2011
    Assignee: Seagate Technology LLC
    Inventors: James C. Alexander, Jason H. Laks
  • Publication number: 20100050046
    Abstract: Systems for identifying potentially erroneous and/or erased data are provided. Systems have a bit detector, an accumulator, and a data reconstruction processor. The bit detector assigns values to bits read in a data signal. The bit detector illustratively assigns multiple values to each of the bits. The accumulator accumulates a count of the multiple values assigned by the bit detector for each of the bits. The accumulator associates each bit with a particular value based at least in part on its accumulated count. The data reconstruction processor determines for each of the bits a confidence level of the particular value associated to it. The data reconstruction process sets flags for a portion of the bits. The flags identify the portion of the bits as possible erased or erroneous data. The flags are set based at least in part on the confidence levels of the portion of the bits.
    Type: Application
    Filed: November 5, 2009
    Publication date: February 25, 2010
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Michael H. Chen, Rajita Shrestha, James C. Alexander
  • Patent number: 7657957
    Abstract: A dock leveler for bridging the gap between a loading dock and the bed of a vehicle parked at the loading dock. The dock leveler is configured for installation on the top of the dock and is designed to rotate from a vertically-stored raised position to at least one lowered, operative position. In some embodiments, the dock leveler can be lowered either for normal operation so that the deck assembly rests on the bed of the vehicle or it can be lowered to accommodate an end-loading condition.
    Type: Grant
    Filed: October 2, 2006
    Date of Patent: February 9, 2010
    Assignee: 4Front Engineered Solutions, Inc.
    Inventors: James C. Alexander, Richard Hoofard
  • Patent number: 7634706
    Abstract: A system for enhancing the error correction capability of an error correction code (“ECC”) during error recovery operations accumulates, for respective bits, counts of the number of times the bits are detected as 1s in multiple re-reads of a data signal. The system then determines, based on the associated count, if a reconstructed bit should be considered a 1 or 0, or neither, that is, if the reconstructed bit should be considered erroneous, by comparing the count to a majority detection threshold and then to either an upper or a lower predetermined threshold that corresponds to the confidence with which the bit is reconstructed as a either a 1 or a 0. If the confidence is sufficiently low, that is, if the count falls below the upper threshold or above the lower threshold, the reconstructed bit is flagged as erroneous.
    Type: Grant
    Filed: July 5, 2006
    Date of Patent: December 15, 2009
    Assignee: Seagate Technology LLC
    Inventors: Michael H. Chen, Rajita Shrestha, James C. Alexander
  • Patent number: 7502194
    Abstract: A method for detecting head-disc contact in a disc drive is disclosed. The method comprises monitoring an output signal from a head positioning microactuator on a read/write head in the disc drive and evaluating the output signal to determine if the read/write head contacts a disc of the disc drive.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: March 10, 2009
    Assignee: Seagate Technology LLC
    Inventors: James C. Alexander, Jason H. Laks
  • Patent number: 7409739
    Abstract: A dock leveler support frame includes an upper frame member and a substantially vertical frame member connected thereto. The substantially vertical frame member includes both a structural member and a height-adjusting leg assembly. The leg assembly is adjustable via a drive member proximate the upper frame member. Rotating the drive member raises or lowers the upper frame member by altering the distance between the upper frame member and a foot at the lower end of the leg assembly. Ramp attachment points are also provided proximate the upper frame member. The support frame is installed by placing it in a pit with the upper frame member adjacent the curb, and adjusting the leg assembly to level the upper frame member to the curb. Once level, the back frame is secured to the dock, and the drive member may be secured to the upper frame member to prevent counter-rotation.
    Type: Grant
    Filed: February 6, 2006
    Date of Patent: August 12, 2008
    Assignee: 4Front Engineered Solutions, Inc.
    Inventors: L. Blake Whitley, James C. Alexander, Richard Hoofard, David Saliger, Keith F. Moore
  • Patent number: 7353558
    Abstract: A dock leveler for bridging the gap between a loading dock and the bed of a vehicle parked at the loading dock. The dock leveler is configured for installation on the top of the dock and is designed to rotate from a vertically-stored raised position to at least one lowered, operative position. In some embodiments, the dock leveler can be lowered either for normal operation so that the deck assembly rests on the bed of the vehicle or it can be lowered to accommodate an end-loading condition.
    Type: Grant
    Filed: March 21, 2006
    Date of Patent: April 8, 2008
    Assignee: 4Front Engineered Solutions, Inc.
    Inventors: James C. Alexander, Richard Hoofard
  • Patent number: 7274300
    Abstract: A loading dock apparatus remote control is provided. Some embodiments of the invention include a zone specific remote control for loading dock apparatus. Some optional embodiments include a selector switch to select which apparatus the single set of controls will control. Other optional embodiments automatically select the apparatus to be controlled by the single set of controls. A method of operating loading dock apparatus using a remote control is also provided.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: September 25, 2007
    Assignee: 4Front Engineering Solutions, Inc.
    Inventors: Kim Duvernell, Terence Reynard, James C. Alexander
  • Patent number: 7256703
    Abstract: A loading dock apparatus remote control is provided. Some embodiments of the invention include a zone specific remote control for loading dock apparatus. Some optional embodiments include a selector switch to select which apparatus the single set of controls will control. Other optional embodiments automatically select the apparatus to be controlled by the single set of controls. A method of operating loading dock apparatus using a remote control is also provided.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: August 14, 2007
    Assignee: 4Front Engineered Solutions, Inc.
    Inventors: Kim Duvernell, Terence Reynard, James C. Alexander
  • Patent number: 7225493
    Abstract: A method and apparatus for supporting a dock leveler in a manner to reduce the effects of free fall and stump-out. The apparatus includes the use of a retractable support leg. The method includes maintaining the support leg in a support position and retracting the support leg under certain conditions.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: June 5, 2007
    Assignee: 4 Front Engineered Solutions, Inc.
    Inventors: Richard K. Hoofard, James C. Alexander, Douglas H. Massey, Michael M. Meichtry
  • Patent number: 7213286
    Abstract: A dock leveler for bridging the gap between a loading dock and the bed of a vehicle parked at the loading docket. The dock leveler is configured for installation on the top of the dock and is designed to rotate from a vertically-stored position to at least one lowered, operative position. In some embodiments, the dock leveler can be lowered either for normal operation so that the deck rests on the bed of the vehicle or it can be lowered to accommodate an end-loading condition. The docket leveler has a horizontally translatable ramp.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: May 8, 2007
    Assignee: 4Front Engineered Solutions, Inc.
    Inventors: Richard K. Hoofard, James C. Alexander