Patents by Inventor Lawrence A. Hansen

Lawrence A. Hansen 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).

  • Publication number: 20160196839
    Abstract: A system including a magnetic tape processing system that includes a read/write head to write to a top surface of a magnetic tape. The read/write head provides a write head field gradient of at least 40 Oersteds per nanometer at the top surface of the magnetic tape. The magnetic tape processing system and the read/write head provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.
    Type: Application
    Filed: March 15, 2016
    Publication date: July 7, 2016
    Inventors: Mike Alan Holmberg, Geoff Spratt, Brian Brong, Mike Sharrock, Steven L. Brittenham, Scott A. Swanbeck, Eric Petersen, Lawrence A. Hansen, Paul W. Poorman
  • Patent number: 9336808
    Abstract: A system including a magnetic tape processing system that includes a read/write head to write to a top surface of a magnetic tape. The read/write head provides a write head field gradient of at least 40 Oersteds per nanometer at the top surface of the magnetic tape. The magnetic tape processing system and the read/write head provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: May 10, 2016
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Mike Alan Holmberg, Geoff Spratt, Brian Brong, Mike Sharrock, Steven L. Brittenham, Scott A. Swanbeck, Eric Petersen, Lawrence A. Hansen, Paul W. Poorman
  • Publication number: 20150302879
    Abstract: A system including a magnetic tape processing system that includes a read/write head to write to a top surface of a magnetic tape. The read/write head provides a write head field gradient of at least 40 Oersteds per nanometer at the top surface of the magnetic tape. The magnetic tape processing system and the read/write head provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.
    Type: Application
    Filed: January 31, 2013
    Publication date: October 22, 2015
    Inventors: Mike Alan HOLMBERG, Geoff SPRATT, Brian BRONG, Mike SHARROCK, Steven L. BRITTENHAM, Scott A. SWANBECK, Eric PETERSEN, Lawrence A. HANSEN, Paul W. POORMAN
  • Patent number: 9142224
    Abstract: Embodiments of the present invention are directed to the design and implementation of backward-compatible magnetic tape drives (102) that are read/write compatible with a current magnetic-tape format (1820) as well as one or more previous magnetic-tape formats (1802 and 1804). Embodiments of the present invention include read/write tape-head configurations (1902, 1904, 1906, 1908-1923, 1930, 1932, 1934, 2102) and corresponding magnetic-tape-drive-component features (518) that allow a magnetic-tape drive to read and write magnetic tapes formatted according to different formats.
    Type: Grant
    Filed: October 24, 2008
    Date of Patent: September 22, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Lawrence A. Hansen, Paul W. Poorman, Jeffrey S. McAllister
  • Patent number: 8737007
    Abstract: Methods and apparatus are provided related to magnetic recording tape. Respective voltage sources are coupled to respective magnetic head components of a tape recording apparatus. Circuitry controls each voltage source independently in accordance with identity information for a magnetic tape, relative humidity within the tape recording apparatus, or other factors. Chemical migration from the tape, and/or plating or erosion of elements of the tape recording apparatus are substantially reduced or eliminated according to the present teachings.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: May 27, 2014
    Assignees: Hewlett-Packard Development Company, L.P., Quantum Corporation
    Inventors: Paul Poorman, Geoff Spratt, Mike Holmberg, Lawrence A Hansen, Brian Brong, Richard Dee
  • Publication number: 20130258517
    Abstract: Methods and apparatus are provided related to magnetic recording tape. Respective voltage sources are coupled to respective magnetic head components of a tape recording apparatus. Circuitry controls each voltage source independently in accordance with identity information for a magnetic tape, relative humidity within the tape recording apparatus, or other factors. Chemical migration from the tape, and/or plating or erosion of elements of the tape recording apparatus are substantially reduced or eliminated according to the present teachings.
    Type: Application
    Filed: March 28, 2012
    Publication date: October 3, 2013
    Inventors: Paul Poorman, Geoff Spratt, Mike Holmberg, Lawrence A. Hansen, Brian Brong, Richard Dee
  • Patent number: 8264795
    Abstract: A flexible circuit having a first end attached to a clamping mechanism and a second end attached to a carriage to move, a magnetic head to read a tape. The clamping mechanism has a curved surface to allow the flexible circuit to maintain an S-shape when the magnetic head moves with respect to the magnetic tape.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: September 11, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Paul W. Poorman, Lawrence A. Hansen, Marc R. Humann
  • Publication number: 20110271729
    Abstract: Various embodiments are disclosed for a flexible circuit. In one embodiment, the flexible circuit bends on a curved surface to form a partial loop.
    Type: Application
    Filed: July 15, 2011
    Publication date: November 10, 2011
    Inventors: Paul W. Poorman, Lawrence A. Hansen, Marc R. Humann
  • Patent number: 8004797
    Abstract: Various embodiments are disclosed for a flexible circuit. In one embodiment, the flexible circuit bends on a curved surface to form a partial loop.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: August 23, 2011
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Paul W. Poorman, Lawrence A. Hansen, Marc R. Humann
  • Publication number: 20110199703
    Abstract: Embodiments of the present invention are directed to the design and implementation of backward-compatible magnetic tape drives (102) that are read/write compatible with a current magnetic-tape format (1820) as well as one or more previous magnetic-tape formats (1802 and 1804). Embodiments of the present invention include read/write tape-head configurations (1902, 1904, 1906, 1908-1923, 1930, 1932, 1934, 2102) and corresponding magnetic-tape-drive-component features (518) that allow a magnetic-tape drive to read and write magnetic tapes formatted according to different formats.
    Type: Application
    Filed: October 24, 2008
    Publication date: August 18, 2011
    Inventors: Lawrence A. Hansen, Paul W. Poorman, Jeffrey S. Mcallister
  • Patent number: 7656614
    Abstract: A tape back-up drive having a head assembly. The head assembly includes a head configured to read data from a tape and to write data to the tape. The head assembly also includes at least one tape guide disposed adjacent to the head.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: February 2, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Lawrence A. Hansen, Paul W. Poorman, Ralph F. Simmons, Jr.
  • Publication number: 20080266707
    Abstract: Various embodiments are disclosed for a flexible circuit. In one embodiment, the flexible circuit bends on a curved surface to form a partial loop.
    Type: Application
    Filed: April 27, 2007
    Publication date: October 30, 2008
    Inventors: Paul W. Poorman, Lawrence A. Hansen, Marc R. Humann
  • Publication number: 20080074785
    Abstract: A tape back-up drive having a head assembly. The head assembly includes a head configured to read data from a tape and to write data to the tape. The head assembly also includes at least one tape guide disposed adjacent to the head.
    Type: Application
    Filed: September 27, 2006
    Publication date: March 27, 2008
    Inventors: Lawrence A. Hansen, Paul W. Poorman, Ralph F. Simmons
  • Patent number: 7315428
    Abstract: In one embodiment, a magnetic media write signal filter includes a plurality of resistors connected in series across output signal lines of a write driver and a capacitor connected between a junction of resistors and a ground.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: January 1, 2008
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Lawrence A. Hansen, Gary Bartles
  • Patent number: 7196866
    Abstract: An apparatus and method for electrically coupling read elements and write elements of a tape head assembly to another component includes an interconnect structure having plural layers of traces, with the traces comprising write traces electrically connected to respective write elements, and read traces electrically connected to respective read elements. The write traces and read traces are interleaved across a dimension of the interconnect structure.
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: March 27, 2007
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Paul W. Poorman, Ralph F. Simmons, Jr., Lawrence A. Hansen
  • Patent number: 7031089
    Abstract: A tape head assembly comprises a transducer head having plural arrays of transducing elements, the transducing elements comprising at least one of write elements and read elements. The tape head assembly further comprises a set of conditioning elements, the conditioning elements comprising at least one of write drivers and read amplifiers. Multiplexing circuitry selectively couples the conditioning elements to one of the plural arrays of transducing elements.
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: April 18, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Lawrence A. Hansen, Ralph F. Simmons, Jr.
  • Patent number: 6055117
    Abstract: A data recording system includes media such as a magnetic disk or tape, a read/write head assembly, and a circuit that provides a write signal having edge placement equalization. The circuit responds to a binary serial data signal such as a run length limited signal of the type (1,x) and provides a write signal having data transitions corresponding to one of the two binary data values, the absence of a transition corresponding to the other data value. In addition, the write signal is provided with a pair of equalization transitions during periods of no data transitions. A first data transition is shifted away from the last provided equalization transition by a predetermined offset. A second data transition, provided immediately after the first data transition, may be shifted toward the last provided equalization transition. Timing of the data transitions is derived from a clock used to provide the equalization transitions.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: April 25, 2000
    Assignee: Hewlett-Packard Company
    Inventors: Lawrence A. Hansen, Charles B. Gamble, Ralph F. Simmons, Michael C. Allyn