Patents by Inventor Gajendra Shekhawat

Gajendra Shekhawat 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).

  • Scanning near field ultrasound holography
    Patent number: 8316713
    Abstract: A high spatial resolution phase-sensitive technique employs a scanning near field ultrasound holography (SNFUH) methodology for imaging elastic as well as viscoelastic variations across a sample surface. SNFUH uses a near-field approach to measure time-resolved variations in ultrasonic oscillations at a sample surface. As such, it overcomes the spatial resolution limitations of conventional phase-resolved acoustic microscopy (i.e. holography) by eliminating the need for far-field acoustic lenses.
    Type: Grant
    Filed: September 21, 2010
    Date of Patent: November 27, 2012
    Assignee: Northwestern University
    Inventors: Gajendra Shekhawat, Vinayak P. Dravid
  • Scanning Near-Field Ultrasound Holography
    Publication number: 20110036169
    Abstract: A high spatial resolution phase-sensitive technique employs a scanning near field ultrasound holography (SNFUH) methodology for imaging elastic as well as viscoelastic variations across a sample surface. SNFUH uses a near-field approach to measure time-resolved variations in ultrasonic oscillations at a sample surface. As such, it overcomes the spatial resolution limitations of conventional phase-resolved acoustic microscopy (i.e. holography) by eliminating the need for far-field acoustic lenses.
    Type: Application
    Filed: September 21, 2010
    Publication date: February 17, 2011
    Applicant: NORTHWESTERN UNIVERSITY
    Inventors: Gajendra Shekhawat, Vinayak P. Dravid
  • Scanning near field ultrasound holography
    Patent number: 7798001
    Abstract: A high spatial resolution phase-sensitive technique employs a scanning near field ultrasound holography (SNFUH) methodology for imaging elastic as well as viscoelastic variations across a sample surface. SNFUH uses a near-field approach to measure time-resolved variations in ultrasonic oscillations at a sample surface. As such, it overcomes the spatial resolution limitations of conventional phase-resolved acoustic microscopy (i.e. holography) by eliminating the need for far-field acoustic lenses.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: September 21, 2010
    Assignee: Northwestern University
    Inventors: Gajendra Shekhawat, Vinayak P. Dravid
  • Cascaded MOSFET embedded multi-input microcantilever
    Patent number: 7759924
    Abstract: A sensor for detecting mechanical perturbations represented by a change in an electrical signal includes a structure such as a cantilever, membrane, etc. and a field effect transistor such as a MOSFET embedded in the structure. The drain current of the embedded transistor changes with mechanical perturbations in the structure caused, for example, by a biochemical interaction being sensed. A scanning probe microscope utilizes the embedded MOSFET with a BiMOS actuator.
    Type: Grant
    Filed: December 4, 2006
    Date of Patent: July 20, 2010
    Assignee: Northwestern University
    Inventors: Gajendra Shekhawat, Vinayak P Dravid, Soo-Hyun Tark, Arvind K Srivastava
  • SCANNING NEAR FIELD ULTRASOUND HOLOGRAPHY
    Publication number: 20090114024
    Abstract: A high spatial resolution phase-sensitive technique employs a scanning near field ultrasound holography (SNFUH) methodology for imaging elastic as well as viscoelastic variations across a sample surface. SNFUH uses a near-field approach to measure time-resolved variations in ultrasonic oscillations at a sample surface. As such, it overcomes the spatial resolution limitations of conventional phase-resolved acoustic microscopy (i.e. holography) by eliminating the need for far-field acoustic lenses.
    Type: Application
    Filed: October 2, 2008
    Publication date: May 7, 2009
    Inventors: Gajendra Shekhawat, Vinayak P. Dravid
  • Scanning near field ultrasound holography
    Patent number: 7448269
    Abstract: A high spatial resolution phase-sensitive technique employs a scanning near field ultrasound holography (SNFUH) methodology for imaging elastic as well as viscoelastic variations across a sample surface. SNFUH uses a near-field approach to measure time-resolved variations in ultrasonic oscillations at a sample surface. As such, it overcomes the spatial resolution limitations of conventional phase-resolved acoustic microscopy (i.e. holography) by eliminating the need for far-field acoustic lenses.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: November 11, 2008
    Assignee: Northwestern University
    Inventors: Gajendra Shekhawat, Vinayak P. Dravid
  • CASCADED MOSFET EMBEDDED MULTI-INPUT MICROCANTILEVER
    Publication number: 20070145966
    Abstract: A sensor for detecting mechanical perturbations represented by a change in an electrical signal includes a structure such as a cantilever, membrane, etc. and a field effect transistor such as a MOSFET embedded in the structure. The drain current of the embedded transistor changes with mechanical perturbations in the structure caused, for example, by a biochemical interaction being sensed. A scanning probe microscope utilizes the embedded MOSFET with a BiMOS actuator.
    Type: Application
    Filed: December 4, 2006
    Publication date: June 28, 2007
    Inventors: Gajendra Shekhawat, Vinayak Dravid
  • Method and system for electronic detection of mechanical perturbations using BIMOS readouts
    Patent number: 7157897
    Abstract: A sensor for detecting mechanical perturbations represented by a change in an electrical signal includes a structure such as a cantilever, membrane, etc. and a field effect transistor such as a MOSFET embedded in the structure. The drain current of the embedded transistor changes with mechanical perturbations in the structure caused, for example, by a bio-chemical interaction being sensed. A scanning probe microscope utilizes the embedded MOSFET with a BiMOS actuator.
    Type: Grant
    Filed: November 23, 2004
    Date of Patent: January 2, 2007
    Assignee: Northwestern University
    Inventors: Gajendra Shekhawat, Vinayak P. Dravid
  • Scanning near field ultrasound holography
    Publication number: 20060037401
    Abstract: A high spatial resolution phase-sensitive technique employs a scanning near field ultrasound holography (SNFUH) methodology for imaging elastic as well as viscoelastic variations across a sample surface. SNFUH uses a near-field approach to measure time-resolved variations in ultrasonic oscillations at a sample surface. As such, it overcomes the spatial resolution limitations of conventional phase-resolved acoustic microscopy (i.e. holography) by eliminating the need for far-field acoustic lenses.
    Type: Application
    Filed: October 6, 2005
    Publication date: February 23, 2006
    Inventors: Gajendra Shekhawat, Vinayak Dravid
  • Method and system for electronic detection of mechanical perturbations using BiMOS readouts
    Publication number: 20050151530
    Abstract: A sensor for detecting mechanical perturbations represented by a change in an electrical signal includes a structure such as a cantilever, membrane, etc. and a field effect transistor such as a MOSFET embedded in the structure. The drain current of the embedded transistor changes with mechanical perturbations in the structure caused, for example, by a bio-chemical interaction being sensed. A scanning probe microscope utilizes the embedded MOSFET with a BiMOS actuator.
    Type: Application
    Filed: November 23, 2004
    Publication date: July 14, 2005
    Inventors: Gajendra Shekhawat, Vinayak Dravid
  • Near field acoustic holography with scanning probe microscope (SPM)
    Publication number: 20050056782
    Abstract: A high spatial resolution phase-sensitive technique employs a near field ultrasonic holography methodology for imaging elastic as well as viscoelastic variations across a sample surface. Near field ultrasonic holography (NFUH) uses a near-field approach to measure time-resolved variations in ultrasonic oscillations at a sample surface. As such, it overcomes the spatial resolution limitations of conventional phase-resolved acoustic microscopy (i.e. holography) by eliminating the need for far-field acoustic lenses.
    Type: Application
    Filed: August 6, 2004
    Publication date: March 17, 2005
    Inventors: Gajendra Shekhawat, Vinayak Dravid