Patents by Inventor P. Walker

P. Walker 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: 9121017
    Abstract: The present invention provides a thermoresponsive nanoparticle useful for the stabilization of enzymes in environments having a temperature greater than thirty degrees Centigrade. The thermoresponsive nanoparticle has (a) a functionalized enzyme conjugate having one or more enzymes or biological catalysts, the enzymes or biological catalysts are modified with palmitic acid N-hydroxysuccinimide ester and acryclic acid N-hydroxysuccinimide ester, and (b) a thermally responsive polymer, wherein the functionalized enzyme conjugate is encapsulated within the thermally responsive polymer. A nanocatalyst is provided that has one or more proteins. The proteins are covalently immobilized and encapsulated within a thermally responsive polymer shell. The proteins are one or more enzymes or biological catalysts. A method for protecting the proteins is also set forth.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: September 1, 2015
    Assignee: FLIR Detection, Inc.
    Inventors: Jeremy P. Walker, Anna M. Leech
  • Publication number: 20150223902
    Abstract: A method for facilitating a medical or surgical procedure in an operating site in a body of a patient may involve: displaying a first point on a first two-dimensional image of the operating site into which an elongate, flexible catheter device is inserted in response to a first user input; mapping the first point on at least a second two-dimensional image of the operating site, the second two-dimensional image being oriented at a non-zero angle with respect to the first two-dimensional image; displaying a first line on the second image that projects from the first point; displaying a second point on the second image in response to a second user input; and determining a three-dimensional location within the operating site, based on the first line and the second point on the second image.
    Type: Application
    Filed: January 26, 2015
    Publication date: August 13, 2015
    Inventors: Sean P. Walker, June Park
  • Publication number: 20150174283
    Abstract: A smart antimicrobial material and dressing to inhibit microbial growth is provided. Endogenous chemicals, such as metabolites produced from bacteria are utilized as chemical substrates and converted by enzymes to produce a disinfecting compound that will in turn inhibit the targeted microorganism. The material shall remain passive until such time as it encounters a microbe which expresses and/or secretes specific metabolites or markers. The enzyme or enzymes embedded in the smart material converts the metabolite into a disinfecting compound, which in turn either kills the microorganism or prevents it from multiplying on the surface of the material.
    Type: Application
    Filed: March 2, 2015
    Publication date: June 25, 2015
    Inventors: Anna M. Leech, Jeremy P. Walker, Scott Donahue, Jermaine D. Johnson, Jessica J. Sinclair
  • Patent number: 9065610
    Abstract: Systems and methods for smoothing jitter generated by byte stuffing. A frequency synthesizer comprises a smoothing logic coupled with a PLL. The smoothing logic is configured to modify a phase error signal generated by a phase frequency detector into a distributed phase error signal that spread over multiple clock cycles. The distributed phase error signal is used to drive a DCO. The smoothing logic may comprise a ramping logic operable to generate a series of ramping values to substitute a phase difference in the phase error signal. The phase difference may correspond to a stuffing byte.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: June 23, 2015
    Assignee: Applied Micro Circuits Corporation
    Inventors: Yehuda Azenkot, Timothy P. Walker
  • Patent number: 9057600
    Abstract: For position sensors, e.g., a fiber-based system, that build a shape of an elongated member such as a catheter using a sequence of small orientation measurements, a small error in orientation at the proximal end of the sensor will cause large error in position at distal points on the fiber. Exemplary methods and systems are disclosed which may provide full or partial registration along the length of the sensor to reduce the influence of the measurement error. Additional examples are directed to applying selective filtering at a proximal end of the elongated member to provide a more stable base for distal measurements and thereby reducing the influence of measurement errors.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: June 16, 2015
    Assignee: Hansen Medical, Inc.
    Inventors: Sean P. Walker, Serena H. Wong, June Park, Neal A. Tanner
  • Publication number: 20150142013
    Abstract: Systems and methods for introducing and driving flexible members in a patient's body are described herein. In one embodiment, a robotic method includes positioning a flexible elongated member that has a preformed configuration, wherein at least a part of the flexible elongated member has a first member disposed around it, and wherein the first member includes a first wire for bending the first member or for maintaining the first member in a bent configuration, releasing at least some tension in the first wire to relax the first member, and advancing the first member distally relative to the flexible elongated member while the first member is in a relaxed configuration.
    Type: Application
    Filed: January 23, 2015
    Publication date: May 21, 2015
    Inventors: Neal A. Tanner, Teresa Miller, Christopher M. Sewell, Sean P. Walker
  • Publication number: 20150110233
    Abstract: Systems and methods for efficient jitter mitigation or removal from a gapped signal. A phase mitigation module is employed to generate discrete correction values for modifying phase error signals detected between a gapped signal and a feedback signal of the PLL. The correction values can be digitally subtracted from the output of a phase frequency detector associated with the PLL. The sequence of correction values can be determined based on phase frequency differences between the input signal and a targeted feedback signal that is free of jitter and has a period equal to an average period of the input signal. An average of the correction values is substantially equal to zero, and an average of the modified phase error signal is substantially equal to zero.
    Type: Application
    Filed: October 23, 2013
    Publication date: April 23, 2015
    Applicant: Applied Micro Circuits Corporation
    Inventors: Yehuda AZENKOT, Timothy P. Walker
  • Patent number: 9008255
    Abstract: Systems and methods for efficient jitter mitigation or removal from a gapped signal. A phase mitigation module is employed to generate discrete correction values for modifying phase error signals detected between a gapped signal and a feedback signal of the PLL. The correction values can be digitally subtracted from the output of a phase frequency detector associated with the PLL. The sequence of correction values can be determined based on phase frequency differences between the input signal and a targeted feedback signal that is free of jitter and has a period equal to an average period of the input signal. An average of the correction values is substantially equal to zero, and an average of the modified phase error signal is substantially equal to zero.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: April 14, 2015
    Assignee: Applied Micro Circuits Corporation
    Inventors: Yehuda Azenkot, Timothy P. Walker
  • Patent number: 9001626
    Abstract: A timer for measuring a time lapsed during an acceleration is disclosed. The timer may include a piezoelectric sensor, an energy storage device and a measurement module. The piezoelectric sensor includes a piezoelectric material for generating an electric potential in response to the acceleration. The energy storage device is electrically coupled to the piezoelectric sensor and is configured for receiving the electric potential generated by the piezoelectric sensor. The measurement module is electrically coupled to the energy storage device. The measurement module measures the electric potential received at the energy storage device and determines the time lapsed during the acceleration based on the electric potential received at the energy storage device.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: April 7, 2015
    Assignee: Rockwell Collins, Inc.
    Inventors: Vadim Olen, Anders P. Walker, Adrian A. Hill, Michael C. Meholensky
  • Patent number: 8996405
    Abstract: A system is described for providing for a revenue generator to bid exclusively on mobile search traffic. The system may include a processor, a memory and an interface. The memory may store a plurality of bids, a keyword, a mobile search request and a mobile advertisement associated with a revenue generator. The interface may communicate with a user and a plurality of revenue generators. The processor may receive bids on the keyword from the revenue generators. The bids may apply to the keyword when the keyword is searched for through the mobile carrier. The processor may receive the mobile search request from the user. The processor may determine if the mobile search request originated from the mobile carrier. The processor may serve the user the advertisement if the mobile search request originated from the mobile carrier, otherwise the mobile advertisement is not served for the keyword.
    Type: Grant
    Filed: July 30, 2007
    Date of Patent: March 31, 2015
    Assignee: Yahoo! Inc.
    Inventors: Arvind Gupta, Kenta Umezu, Sean P. Walker, Ian B. Brayshaw
  • Publication number: 20150073905
    Abstract: A system is described for providing for a revenue generator to bid exclusively on mobile search traffic. The system may include a processor, a memory and an interface. The memory may store a plurality of bids, a keyword, a mobile search request and a mobile advertisement associated with a revenue generator. The interface may communicate with a user and a plurality of revenue generators. The processor may receive bids on the keyword from the revenue generators. The bids may apply to the keyword when the keyword is searched for through the mobile carrier. The processor may receive the mobile search request from the user. The processor may determine if the mobile search request originated from the mobile carrier. The processor may serve the user the advertisement if the mobile search request originated from the mobile carrier, otherwise the mobile advertisement is not served for the keyword.
    Type: Application
    Filed: November 13, 2014
    Publication date: March 12, 2015
    Applicant: YAHOO! INC.
    Inventors: Arvind Gupta, Kenta Umezu, Sean P. Walker, Ian B. Brayshaw
  • Publication number: 20140375364
    Abstract: Systems and methods for frequency synthesis using a gapper and a multi-modulus divider. A frequency synthesizer may comprise a gapper, a multi-modulus divider and a Phase Locked Loop (PLL). When a frequency of an output signal is intended to be greater than a corresponding input signal, a factor can be borrowed by the gapper from the divider to generate a rational divide ratio G that is greater 1 in order for the gapper to be capable of performing the division by G. The PLL is capable of multiplying a gapped signal output from the first integer divider and attenuating jitter from the gapped signal.
    Type: Application
    Filed: August 26, 2014
    Publication date: December 25, 2014
    Inventors: Yehuda AZENKOT, Michael GROSNER, Timothy P. WALKER
  • Publication number: 20140314192
    Abstract: Systems and methods for smoothing jitter generated by byte stuffing. A frequency synthesizer comprises a smoothing logic coupled with a PLL. The smoothing logic is configured to modify a phase error signal generated by a phase frequency detector into a distributed phase error signal that spread over multiple clock cycles. The distributed phase error signal is used to drive a DCO. The smoothing logic may comprise a ramping logic operable to generate a series of ramping values to substitute a phase difference in the phase error signal. The phase difference may correspond to a stuffing byte.
    Type: Application
    Filed: April 18, 2013
    Publication date: October 23, 2014
    Applicant: Applied Micro Circuits Corporation
    Inventors: Yehuda AZENKOT, Timothy P. WALKER
  • Publication number: 20140264081
    Abstract: For position sensors, e.g., a fiber-based system, that build a shape of an elongated member such as a catheter using a sequence of small orientation measurements, a small error in orientation at the proximal end of the sensor will cause large error in position at distal points on the fiber. Exemplary methods and systems are disclosed which may provide full or partial registration along the length of the sensor to reduce the influence of the measurement error. Additional examples are directed to applying selective filtering at a proximal end of the elongated member to provide a more stable base for distal measurements and thereby reducing the influence of measurement errors.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Inventors: Sean P. Walker, Serena H. Wong, June Park, Neal A. Tanner
  • Publication number: 20140266339
    Abstract: Systems and methods for generating gapped signals comprising a Delta Sigma Modulator (DSM) configured to generate gapping control signals used to control gap removal rates of an associated gapping unit. The DSM is configured to generate a gapping control signal based on a value of an overflow resulted from performing adding a first number with a remainder of a stored value modulo a second number. The gap removal rates as well as the gap removal resolutions can be adjusted by selecting appropriate values of the first number, the stored value, and the second number. The gapping resolution can be a portion of a pulse. The first number and the second number may be derived from an intended frequency ratio between a gapped signal and a corresponding input signal. The gapping unit may comprise a gapping circuit or a multi-modulus divider.
    Type: Application
    Filed: March 18, 2013
    Publication date: September 18, 2014
    Applicant: APPLIED MICRO CIRCUITS CORPORATION
    Inventors: Yehuda AZENKOT, Michael GROSNER, Timothy P. WALKER
  • Publication number: 20140266328
    Abstract: Systems and methods for frequency synthesis using a gapper. A frequency synthesizer may comprise a gapper, a first integer divider and a Phase Locked Loop (PLL). When a frequency of an output signal is intended to be greater than a corresponding input signal, a factor can be borrowed by the gapper from the first integer divider to generate a rational divide ratio G that is greater 1 in order for the gapper to be capable of performing the division by G. The PLL is capable of multiplying a gapped signal output from the first integer divider and attenuating jitter from the gapped signal.
    Type: Application
    Filed: March 18, 2013
    Publication date: September 18, 2014
    Applicant: APPLIED MICRO CIRCUITS CORPORATION
    Inventors: Yehuda AZENKOT, Michael GROSNER, Timothy P. WALKER
  • Publication number: 20140257334
    Abstract: One exemplary user interface for a medical robotics system may include a control panel and one or more sliders that may be slidably carried by the control panel to actuate one or more motors for moving a surgical instrument of the medical robotics system. The sliders may be configured to actuate the motors to move the surgical instrument along a respective one of a plurality of degrees of freedom.
    Type: Application
    Filed: March 7, 2014
    Publication date: September 11, 2014
    Inventors: Serena H. Wong, Sean P. Walker, June Park, Richard Henderson
  • Patent number: 8816730
    Abstract: Systems and methods for frequency synthesis using a gapper. A frequency synthesizer may comprise a gapper, a first integer divider and a Phase Locked Loop (PLL). When a frequency of an output signal is intended to be greater than a corresponding input signal, a factor can be borrowed by the gapper from the first integer divider to generate a rational divide ratio G that is greater 1 in order for the gapper to be capable of performing the division by G. The PLL is capable of multiplying a gapped signal output from the first integer divider and attenuating jitter from the gapped signal.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: August 26, 2014
    Assignee: Applied Micro Circuits Corporation
    Inventors: Yehuda Azenkot, Michael Grosner, Timothy P. Walker
  • Patent number: 8818780
    Abstract: A method of forming a geologic model of a subsurface region is disclosed. Data related to the subsurface region is obtained. A framework is constructed to represent the subsurface region. A template is selected from a plurality of templates. The selected template provides at least one property that is characteristic of the subsurface region. The selected template is inserted into the framework, to form the geologic model. The geologic model is then outputted.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: August 26, 2014
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Craig S. Calvert, Gregory S. Benson, Xiao-Hui Wu, Dachang Li, Deborah F. Kosich, Lawrence P. Walker
  • Publication number: 20140226980
    Abstract: Techniques for multiplexing and demultiplexing signals for optical transport networks are presented. A network component comprises a multiplexer component that multiplexes a plurality of signals having a first signal format to produce a multiplexed signal in accordance with a second signal format, while maintaining error correction code (ECC) of such signals and without decoding such signals and associated ECC. The multiplexer component interleaves the plurality of signals with stuffing and adds overhead without generating new ECC. A second network component receives the multiplexed signal as part of a frame in accordance with the second signal format. A demultiplexer component of the second network component demultiplexes the multiplexed signal using the original ECC associated with the plurality of signals, wherein the second network element removes and filters the stuffing from the multiplexed signal and produces a plurality of demultiplexed signals as an output, in accordance with the first signal format.
    Type: Application
    Filed: February 12, 2013
    Publication date: August 14, 2014
    Applicant: APPLIED MICRO CIRCUITS CORPORATION
    Inventor: Timothy P. Walker