Patents by Inventor John Contreras

John Contreras 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: 20110017079
    Abstract: A collapsible food tray heater is disclosed wherein the food tray heater has solid sidewalls to block wind from blowing out a fire source when the collapsible food tray heater is used outdoors especially during windy conditions. Additionally, the solid walls of the collapsible food tray heater retain the heat within the heater to keep the food in the food tray hotter compared to prior art chafing dishes. The collapsible food tray heater may be collapsed such that the collapsed food tray heaters may be stacked upon each other for convenient storage and transport.
    Type: Application
    Filed: July 24, 2009
    Publication date: January 27, 2011
    Inventors: Lloyd LeRoy Wall, Richard Eugene Miller, Robert John Contreras
  • Patent number: 7830634
    Abstract: In a method of head-disk contact detection in a hard disk drive, a Radio Frequency (RF) carrier signal is injected into a slider which is flying above a surface of a disk in a hard disk drive. A modulated version of the RF carrier signal is received from the slider. The modulated version of the RF carrier signal is demodulated to achieve a demodulated signal. A signal spectrum of a range of frequencies in the demodulated signal is monitored for activity indicative of a contact between a head of the slider and the surface of the disk. An occurrence of the contact is determined based upon an occurrence of the activity.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: November 9, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Martin Yu-Wen Chen, John Contreras, Luiz M. Franca-Neto, Bernhard E. Knigge
  • Publication number: 20100157454
    Abstract: In a method of head-disk contact detection in a hard disk drive, a Radio Frequency (RF) carrier signal is injected into a slider which is flying above a surface of a disk in a hard disk drive. A modulated version of the RF carrier signal is received from the slider. The modulated version of the RF carrier signal is demodulated to achieve a demodulated signal. A signal spectrum of a range of frequencies in the demodulated signal is monitored for activity indicative of a contact between a head of the slider and the surface of the disk. An occurrence of the contact is determined based upon an occurrence of the activity.
    Type: Application
    Filed: December 23, 2008
    Publication date: June 24, 2010
    Inventors: Martin Yu-Wen CHEN, John Contreras, Luiz M. Franca-Neto, Bernhard E. Knigge
  • Publication number: 20100142096
    Abstract: In a method of biasing a slider, a bias voltage is generated for biasing a slider. The bias voltage is integratedly coupled to a conductive body of the slider via an existing signal path of the slider such that the slider is biased with the bias voltage. The existing signal path is primarily used for conveying another signal to or from the slider but at least sometimes conveys the bias voltage to the conductive body in an integral fashion along with another signal.
    Type: Application
    Filed: December 4, 2008
    Publication date: June 10, 2010
    Inventors: John Contreras, Luiz Franca-Neto, Bernhard Knigge
  • Publication number: 20100128397
    Abstract: A flex cable comprises a base film, a first adhesive layer coupled with the base film, and at least two signal traces coupled with the first adhesive layer. The flex cable comprises a second adhesive layer coupled with the signal traces and the first adhesive layer, and a cover film coupled with the second adhesive layer. The flex cable comprises an electrically conductive layer adjacent to the signal traces, and parallel with the base film and the cover film.
    Type: Application
    Filed: November 25, 2008
    Publication date: May 27, 2010
    Inventors: John CONTRERAS, Luiz M. FRANCA-NETO, Jr-Yi SHEN
  • Patent number: 7667914
    Abstract: Embodiments of the present invention provide a mixed-mode amplifier for amplifying signals in data storage devices such as disk drives. In one embodiments, a circuit for amplifying data signals comprises a magnetoresistive sensor having a bias voltage applied thereto; a signal amplifier which amplifies a signal detected by the magnetoresistive sensor having the bias voltage applied thereto; a feedback control block which is coupled to an output of the signal amplifier and outputs a feedback current used to vary a loop gain of the circuit; a bias setting circuit which outputs a bias setting current; and a transimpedance amplifier which receives the bias setting current from the bias setting block and the feedback current from the feedback control block and generates the bias voltage applied to the magnetoresistive sensor.
    Type: Grant
    Filed: April 17, 2006
    Date of Patent: February 23, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: John Contreras, Klaas Klaassen
  • Publication number: 20090190253
    Abstract: A method for manufacturing a hard disk drive is described. The method includes providing a motor assembly, the motor assembly comprising a stationary portion and a rotatable portion for rotating a magnetic disk with respect to said stationary portion and providing a base for receiving the motor assembly. The method further includes providing an adhesive for mounting the motor assembly to said base wherein the adhesive is electrically conductive and mounting the stationary portion of the motor assembly to the base utilizing the adhesive such that the adhesive provides a low resistance path between the base and the motor assembly.
    Type: Application
    Filed: January 28, 2008
    Publication date: July 30, 2009
    Inventors: John Contreras, Klaas B. Klaassen
  • Patent number: 7545608
    Abstract: A current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) read head structure has the MR read head located between first and second shields (S1, S2) on a substrate with a shunt resistor R1 connecting S1 to the substrate and a shunt resistor R2 connecting S2 to the substrate, with R1 and R2 being approximately equal. Because R1 and R2 are close enough in value there is no significant interference pickup in the low frequency region. The shunt resistors can be formed from high-resistivity metal nitrides or cermets. The spacing between the substrate and S1 may be selected to make the capacitance between S1 and the substrate approximately equal to the capacitance between S2 and the substrate to substantially reduce interference pickup in the high frequency region.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: June 9, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Satoru Araki, John Contreras, Klaas Berend Klaassen, Ramona Marie Patterson, David John Seagle, Howard Gordon Zolla
  • Patent number: 7417209
    Abstract: A system and method for preventing crosstalk noise from being superimposed on a read signal due to noise from a heater line for a slider in a recording disk drive is disclosed. A heater line pair to the slider is not grounded but is in a floating state with respect to an actuator support structure. A heater driver allows a heater current to flow between a positive power supply voltage and a negative power supply voltage. The heater line pair is not grounded, so an impedance is high as viewed from a magnetic disk. Thus, it is possible to effectively suppress a noise transmitted from the magnetic disk and read signal quality is kept from deteriorating due to the crosstalk from the heater line.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: August 26, 2008
    Assignee: Hitachi Global Storage Technologies Netherlands BV
    Inventors: John Contreras, Takashi Ikeda, Yumi Nagano, Nobumasa Nishiyama, Toyomi Ohsawa, Mike Suk
  • Publication number: 20080100970
    Abstract: A current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) read head structure has the MR read head located between first and second shields (S1, S2) on a substrate with a shunt resistor R1 connecting S1 to the substrate and a shunt resistor R2 connecting S2 to the substrate, with R1 and R2 being approximately equal. Because R1 and R2 are close enough in value there is no significant interference pickup in the low frequency region. The shunt resistors can be formed from high-resistivity metal nitrides or cermets. The spacing between the substrate and S1 may be selected to make the capacitance between S1 and the substrate approximately equal to the capacitance between S2 and the substrate to substantially reduce interference pickup in the high frequency region.
    Type: Application
    Filed: October 30, 2006
    Publication date: May 1, 2008
    Applicant: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
    Inventors: Satoru Araki, John Contreras, Klaas Berend Klaassen, Ramona Marie Patterson, David John Seagle, Howard Gordon Zolla
  • Publication number: 20070242384
    Abstract: Embodiments of the present invention provide a mixed-mode amplifier for amplifying signals in data storage devices such as disk drives. In one embodiments, a circuit for amplifying data signals comprises a magnetoresistive sensor having a bias voltage applied thereto; a signal amplifier which amplifies a signal detected by the magnetoresistive sensor having the bias voltage applied thereto; a feedback control block which is coupled to an output of the signal amplifier and outputs a feedback current used to vary a loop gain of the circuit; a bias setting circuit which outputs a bias setting current; and a transimpedance amplifier which receives the bias setting current from the bias setting block and the feedback current from the feedback control block and generates the bias voltage applied to the magnetoresistive sensor.
    Type: Application
    Filed: April 17, 2006
    Publication date: October 18, 2007
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: John Contreras, Klaas Klaassen
  • Publication number: 20070210070
    Abstract: A system and method for preventing crosstalk noise from being superimposed on a read signal due to noise from a heater line for a slider in a recording disk drive is disclosed. A heater line pair to the slider is not grounded but is in a floating state with respect to an actuator support structure. A heater driver allows a heater current to flow between a positive power supply voltage and a negative power supply voltage. The heater line pair is not grounded, so an impedance is high as viewed from a magnetic disk. Thus, it is possible to effectively suppress a noise transmitted from the magnetic disk and read signal quality is kept from deteriorating due to the crosstalk from the heater line.
    Type: Application
    Filed: February 24, 2006
    Publication date: September 13, 2007
    Inventors: John Contreras, Takashi Ikeda, Yumi Nagano, Nobumasa Nishiyama, Toyomi Ohsawa, Mike Suk
  • Publication number: 20060158785
    Abstract: An electrical lead suspension (ELS) having partitioned air slots. The ELS includes a laminate. A first plurality of signal traces and a second plurality of traces are in a first formed layer of the laminate. The second plurality of traces may be signal traces or power traces. The laminate has a dielectric layer between the first formed layer and a second formed layer. A plurality of partitioned air slots is in the second formed layer of the laminate. The portion of the ELS having a plurality of partitioned air slots supporting the at least the first plurality of signal traces and the portion of the ELS having a second plurality of partitioned air slots or patterns supporting the second plurality of traces. The supporting of the first plurality of signal traces separate from the second plurality of traces reduces write-to-read cross talk and signal loss.
    Type: Application
    Filed: January 18, 2005
    Publication date: July 20, 2006
    Inventors: Satya Arya, John Contreras, Klaas Klaassen, Nobumasa Nishiyama
  • Publication number: 20060152854
    Abstract: A method and apparatus for reducing crosstalk and signal loss in an electrical interconnect is disclosed. The electrical interconnect includes a laminate. A plurality of signal traces and a subsequent plurality of traces are in a first formed layer of the laminate. The subsequent plurality of traces may be signal traces or power traces. The laminate has a dielectric layer between the first formed layer and a second formed layer. A plurality of serpentine patterns are in the second formed layer of the laminate. The plurality of serpentine patterns is separated from subsequent patterns. The plurality of serpentine patterns supports the plurality of signal traces and the subsequent plurality of patterns supports the subsequent plurality of traces. The supporting of the plurality of signal traces separate from the subsequent plurality of traces reduces write-to-read crosstalk and signal loss.
    Type: Application
    Filed: January 13, 2005
    Publication date: July 13, 2006
    Inventors: Satya Arya, John Contreras, Klaas Klaassen, Nobumasa Nishiyama
  • Patent number: 6957561
    Abstract: A apparatus for the paint-less dent repair of vehicles, for applying a leverage force between a rigid internal structure and an inside surface of a panel to be straightened, is disclosed. The apparatus includes an elongated lever, a first tool head attached to the elongated lever proximate to the distal end, and a second tool head attached to the lever between the proximal end and the first tool head. The tool heads are attached to opposite sides of the lever facing opposing directions.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: October 25, 2005
    Inventor: Salomon John Contreras
  • Publication number: 20050174669
    Abstract: In one illustrative example disclosed, a magnetic storage device includes at least one magnetic disk; a magnetic head which includes first and second read sensors; a suspension which supports the magnetic head relative to the magnetic disk; and read circuitry which includes a preamplifier. The preamplifier has a first input port coupled to the first read sensor; a second input port coupled to the second read sensor; a first bias source coupled to the first input port for actively current/voltage biasing the first read sensor; a second bias source coupled to the second input port for zero biasing the second read sensor; and a subtractor having first and second inputs coupled to the first and the second input ports, respectively. The first input of the subtractor is provided with a first signal which includes a read sensor data signal and an interference signal, whereas the second input of the subtractor is provided with a second signal which includes the interference signal but not the read sensor data signal.
    Type: Application
    Filed: February 11, 2004
    Publication date: August 11, 2005
    Inventors: John Contreras, Klaas Klaassen, Jacobus Van Peppen
  • Patent number: D572916
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: July 15, 2008
    Assignee: Elite Leather Company
    Inventors: Michael F Galardo, John Contreras
  • Patent number: D626377
    Type: Grant
    Filed: July 24, 2009
    Date of Patent: November 2, 2010
    Inventors: Robert John Contreras, Richard Eugene Miller, Lloyd LeRoy Wall