Patents by Inventor Srinivasan K. Ganapathi

Srinivasan K. Ganapathi 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: 10036835
    Abstract: A gradient-index lens for directing incident electromagnetic radiation comprises at least one substrate having a plurality of micro-features (e.g., trenches or holes) that may be arranged in a pattern of varied size and/or spacing. Each of the micro-features has at least one dimension that is less than a wavelength of the electromagnetic radiation. The spacing between adjacent micro-features is less than the wavelength of the electromagnetic radiation, and the size and spacing of the micro-features are sufficient to produce an effective refractive index profile of the lens that is graded.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: July 31, 2018
    Assignee: INVIS Technologies Corporation
    Inventors: Gregory J. Kintz, Philip J. Stephanou, Kurt E. Petersen, Srinivasan K. Ganapathi, John Batey
  • Publication number: 20180081091
    Abstract: A gradient-index lens for directing incident electromagnetic radiation comprises at least one substrate having a plurality of micro-features (e.g., trenches or holes) that may be arranged in a pattern of varied size and/or spacing. Each of the micro-features has at least one dimension that is less than a wavelength of the electromagnetic radiation. The spacing between adjacent micro-features is less than the wavelength of the electromagnetic radiation, and the size and spacing of the micro-features are sufficient to produce an effective refractive index profile of the lens that is graded.
    Type: Application
    Filed: November 13, 2017
    Publication date: March 22, 2018
    Applicant: INVIS Technologies Corporation
    Inventors: Gregory J. Kintz, Philip J. Stephanou, Kurt E. Petersen, Srinivasan K. Ganapathi, John Batey
  • Patent number: 9817158
    Abstract: A gradient-index lens for directing incident electromagnetic radiation comprises at least one substrate having a plurality of micro-features (e.g., trenches or holes) that may be arranged in a pattern of varied size and/or spacing. Each of the micro-features has at least one dimension that is less than a wavelength of the electromagnetic radiation. The spacing between adjacent micro-features is less than the wavelength of the electromagnetic radiation, and the size and spacing of the micro-features are sufficient to produce an effective refractive index profile of the lens that is graded. A thermal imaging device incorporating a gradient-index lens is also provided.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: November 14, 2017
    Assignee: INVIS TECHNOLOGIES CORPORATION
    Inventors: Gregory J. Kintz, Philip J. Stephanou, Kurt E. Petersen, Srinivasan K. Ganapathi, John Batey
  • Patent number: 9690014
    Abstract: A gradient-index lens for focusing incident electromagnetic radiation comprises at least first and second substrates. Each of the substrates has a plurality of trenches or holes formed therein. The first substrate is stacked on the second substrate such that trenches or holes in the first substrate are substantially aligned with corresponding trenches or holes in the second substrate to form combined trenches or holes. Each of the combined trenches or holes has a width or diameter that is less than a wavelength of the electromagnetic radiation, and the spacing between adjacent ones of the combined trenches or holes is less than the wavelength of the electromagnetic radiation. The size and spacing of the combined trenches or holes in the stacked substrates are sufficient to produce an effective refractive index profile of the lens element that is graded. A method for producing the lens is also provided.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: June 27, 2017
    Assignee: INVIS TECHNOLOGIES CORPORATION
    Inventors: Gregory J. Kintz, Philip J. Stephanou, Kurt E. Petersen, Srinivasan K. Ganapathi, John Batey
  • Publication number: 20170168199
    Abstract: An imaging device comprises a focal plane array (FPA) having a plurality of singulated unit cells arranged on a carrier substrate. Each of the unit cells comprises a sub-array of pixels in the focal plane array. At least one of the unit cells has a different number or type of pixels than does another one of the unit cells arranged on the carrier substrate to enable multi-spectral imaging. The device also includes at least one lens positioned to direct incident electromagnetic radiation to the unit cells. A modular method for producing the FPA and lenses of a camera core uses wafer-level packaging and optics. Lenses and sub-arrays of pixels are each fabricated on densely packed, batch-fabricated wafers, and subsequently singulated and assembled into arrays on respective low cost carrier substrates. The carrier substrates are bonded together at the substrate level to form a series of camera cores, and the stacked substrates are singulated to form individual camera cores.
    Type: Application
    Filed: February 24, 2017
    Publication date: June 15, 2017
    Applicant: INVIS Technologies Corporation
    Inventors: Srinivasan K. Ganapathi, Philip J. Stephanou, Kurt E. Petersen, John Batey
  • Publication number: 20170116453
    Abstract: In one aspect an electronic device includes a housing having a front surface, a display assembly positioned at a display portion of the front surface, a biometric authentication circuit offset from the front surface, and at least one sensor coupled to the biometric authentication circuit and positioned at a non-display portion of the front surface.
    Type: Application
    Filed: October 23, 2015
    Publication date: April 27, 2017
    Inventor: Srinivasan K. Ganapathi
  • Publication number: 20160380014
    Abstract: A thermal imaging device comprises a focal plane array disposed on a focal plane substrate. The focal plane array comprises a plurality of pixels grouped into sub-arrays of pixels. The device also comprises a lens array comprising a plurality of lenslets. Each of the lenslets is arranged to focus infrared rays on a respective one of the sub-arrays of pixels. The focal plane array is enclosed in a vacuum in a space between the lens array and the focal plane substrate, and a readout circuit is electrically connected to the pixels. The thermal imaging device has a small form factor and low cost while maintaining adequate performance, enabling expanded usage of thermal imaging (e.g., in security, surveillance, first responder, defense and/or automotive applications).
    Type: Application
    Filed: March 13, 2014
    Publication date: December 29, 2016
    Applicant: INVIS TECHNOLOGIES CORPORATION
    Inventors: Srinivasan K. Ganapathi, Philip J. Stephanou, Kurt E. Petersen
  • Publication number: 20160219228
    Abstract: A gradient-index lens for directing incident electromagnetic radiation comprises at least one substrate having a plurality of micro-features (e.g., trenches or holes) that may be arranged in a pattern of varied size and/or spacing. Each of the micro-features has at least one dimension that is less than a wavelength of the electromagnetic radiation. The spacing between adjacent micro-features is less than the wavelength of the electromagnetic radiation, and the size and spacing of the micro-features are sufficient to produce an effective refractive index profile of the lens that is graded. A thermal imaging device incorporating a gradient-index lens is also provided.
    Type: Application
    Filed: December 10, 2015
    Publication date: July 28, 2016
    Applicant: Invis Corporation
    Inventors: Gregory J. Kintz, Philip J. Stephanou, Kurt E. Petersen, Srinivasan K. Ganapathi, John Batey
  • Publication number: 20160216412
    Abstract: A gradient-index lens for focusing incident electromagnetic radiation comprises at least first and second substrates. Each of the substrates has a plurality of trenches or holes formed therein. The first substrate is stacked on the second substrate such that trenches or holes in the first substrate are substantially aligned with corresponding trenches or holes in the second substrate to form combined trenches or holes. Each of the combined trenches or holes has a width or diameter that is less than a wavelength of the electromagnetic radiation, and the spacing between adjacent ones of the combined trenches or holes is less than the wavelength of the electromagnetic radiation. The size and spacing of the combined trenches or holes in the stacked substrates are sufficient to produce an effective refractive index profile of the lens element that is graded. A method for producing the lens is also provided.
    Type: Application
    Filed: December 10, 2015
    Publication date: July 28, 2016
    Applicant: INVIS Corporation
    Inventors: Gregory J. Kintz, Philip J. Stephanou, Kurt E. Petersen, Srinivasan K. Ganapathi, John Batey
  • Publication number: 20150281601
    Abstract: An imaging device comprises a focal plane array (FPA) having a plurality of singulated unit cells arranged on a carrier substrate. Each of the unit cells comprises a sub-array of pixels in the focal plane array. At least one of the unit cells has a different number or type of pixels than does another one of the unit cells arranged on the carrier substrate to enable multi-spectral imaging. The device also includes at least one lens positioned to direct incident electromagnetic radiation to the unit cells. A modular method for producing the FPA and lenses of a camera core uses wafer-level packaging and optics. Lenses and sub-arrays of pixels are each fabricated on densely packed, batch-fabricated wafers, and subsequently singulated and assembled into arrays (e.g., 3×3, 4×4, 4×5) on respective low cost carrier substrates. The carrier substrates are bonded together at the substrate level to form a series of camera cores, and the stacked substrates are singulated to form individual camera cores.
    Type: Application
    Filed: March 24, 2015
    Publication date: October 1, 2015
    Applicant: INVIS TECHNOLOGIES CORPORATION
    Inventors: Srinivasan K. Ganapathi, Philip J. Stephanou, Kurt E. Petersen, John Batey
  • Patent number: 7638350
    Abstract: A method of making an integrated texture sensor for sensing a texture is described. In one embodiment, the method is directed to a sensor that that is protected from external contaminating particulates and will self-equalize using air from outside the sensor. Further combinations of such protection among various membrane switches, in combination with various types of membranes, is described. In another embodiment, a method of making a skin-texture sensor for sensing a skin texture having a plurality of ridges and a plurality of valleys is described, such that when completed, applying a ridge of the texture to a membrane switch will cause flexure of the membrane resulting in a contact between the lower electrode and the upper electrode, the contact establishing an electrical communication between said one of the row lines and said one of the column lines, whereas disposing a valley of the texture over said each membrane switch will not result in the contact between the lower electrode and the upper electrode.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: December 29, 2009
    Assignee: SpringWorks LLC
    Inventors: Keith T. Deconde, Srinivasan K. Ganapathi, Randolph S. Gluck, Steve H. Hovey, Shiva Prakash, Christopher Stoessel
  • Patent number: 7437953
    Abstract: A sheet film protective covering for different types of contour sensing devices is described. In a preferred embodiment, this covering is a MYLAR® sheet film that is coated with a layer of a conductive material. The bottom surface of the MYLAR® film is also preferably coated with a layer of an adhesive. The sheet film covering preferably is contiguous and serves the purpose, among other things, to protect the underlying surface of the pressure-sensing device from contaminants and from electrostatic discharge, as well provide force concentration during use.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: October 21, 2008
    Inventors: Keith T DeConde, Joram Diamant, Srinivasan K. Ganapathi, Joseph J. Pritikin
  • Patent number: 7409876
    Abstract: A sensor for a textured surface (e.g., a fingerprint) is provided. The sensor includes a flexible substrate and a flexible membrane supported above the substrate by one or more spacers. The sensor also includes multiple pressure sensor elements responsive to a separation between parts of the membrane and corresponding parts of the substrate. The membrane is conformable to the textured surface being sensed, so the variation in separation between substrate and membrane is representative of the textured surface being sensed. Such pressure sensors can be included in fingerprint authentication subsystems including associated integrated electronic circuitry (e.g., encryption, image processing, fingerprint matching, communication and/or location determination circuitry). Such subsystems can be included in various access control systems (e.g., smart cards and mobile electronics).
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: August 12, 2008
    Assignee: Fidelica Microsystems
    Inventors: Srinivasan K. Ganapathi, Joseph J. Pritikin
  • Patent number: 7373843
    Abstract: A sensor for a textured surface (e.g., a fingerprint) is provided. The sensor includes a flexible substrate and a flexible membrane supported above the substrate by one or more spacers. The sensor also includes multiple pressure sensor elements responsive to a separation between parts of the membrane and corresponding parts of the substrate. The membrane is conformable to the textured surface being sensed, so the variation in separation between substrate and membrane is representative of the textured surface being sensed. A preferred sensor array arrangement has a set of parallel substrate electrodes on the substrate facing the membrane and a set of parallel membrane electrodes on the membrane facing the substrate, where the substrate and membrane electrodes are perpendicular. The sensor array is preferably an entirely passive structure including no active electrical devices, to reduce cost. Row and column addressing circuitry can be provided as separate units (e.g.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: May 20, 2008
    Assignee: Fidelica Microsystems
    Inventors: Srinivasan K. Ganapathi, Keith T. DeConde, Randolph S. Gluck
  • Patent number: 7316167
    Abstract: A sheet film protective covering for different types of contour sensing devices is described. In a preferred embodiment, this covering is a mylar sheet film that is coated with a layer of a conductive material. The bottom surface of the mylar film is also preferably coated with a layer of an adhesive. The sheet film covering preferably is contiguous and serves the purpose, among other things, to protect the underlying surface of the pressure-sensing device from contaminants and from electrostatic discharge, as well provide force concentration during use.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: January 8, 2008
    Assignee: Fidelica, Microsystems, Inc.
    Inventors: Keith T DeConde, Joram Diamant, Srinivasan K. Ganapathi, Joseph J. Pritikin
  • Patent number: 7290323
    Abstract: A fingerprint-sensing device with a sensor array that does not use active switching elements is fabricated on a base. Sensor support integrated circuits, which contain processing and addressing circuitry, are separately fabricated and subsequently mounted on the base, establishing electrical connections with an interconnect structure within the base, and are thus not integrated with the sensor array. The sensor support integrated circuits can be covered by a bezel structure and the sensor array by a covering material. In addition, a connection cable can be provided to connect the sensor array and the sensor support integrated circuits with a power source and to other external devices and to convey signals generated by the sensor array to the external devices.
    Type: Grant
    Filed: November 14, 2003
    Date of Patent: November 6, 2007
    Assignee: Fidelica Microsystems, Inc.
    Inventors: Keith T. Deconde, Srinivasan K. Ganapathi, Randolph S. Gluck, Steve H. Hovey, Shiva Prakash, Robert Dobkin
  • Patent number: 7077010
    Abstract: The present invention is directed to a method of sensing pressure in which applied pressure causes a change in the magnetization vector of a magnetoresistive layer within the device and a corresponding change in resistance. The method includes providing a sensing device with a sensor including plurality of layers, the plurality of layers comprising a non magnetic conducting layer disposed between a magnetoresistive layer with non-zero magnetostriction and a ferromagnetic biasing layer. Once provided, the method then includes sensing a resistance in the plurality of layers upon application of pressure to the sensing device, the applied pressure causing the magnetization vector of the magnetoresistive layer to change and thereby result in a change in resistance.
    Type: Grant
    Filed: May 5, 2005
    Date of Patent: July 18, 2006
    Assignee: Fidelica Microsystems, Inc.
    Inventor: Srinivasan K. Ganapathi
  • Patent number: 7073397
    Abstract: The invention provides an apparatus for sensing pressure that comprises a substrate and a sensor formed on the substrate. The sensor is adapted to sense pressure applied thereto and includes a support structure smaller than the substrate to result in a cavity above a portion of the substrate and a magnetoresistive sensor formed over the support structure. The magnetoresistive element provides high sensitivity to pressure while maintaining miniaturized dimensions.
    Type: Grant
    Filed: May 5, 2005
    Date of Patent: July 11, 2006
    Assignee: Fidelica Microsystems, Inc.
    Inventor: Srinivasan K. Ganapathi
  • Patent number: 7059201
    Abstract: The present invention provides a pressure sensing device that includes at least one TMR sensor, and preferably an array of TMR sensors, with each TMR sensor having an insulating spacer layer interposed between a pinned and a free ferromagnetic layer. In an unbiased state, the magnetization vector of each of the ferromagnetic layers is preferably parallel to each other. Upon application of a small voltage, the magnetization vectors remain unchanged. Upon application of stress, the magnetization vector of the free magnetic layer will rotate, thus causing a corresponding and proportionally related change in the resistance of the sensor. This change in resistance can be sensed and used to calculate the stress applied thereto.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: June 13, 2006
    Assignee: Fidelica Microsystems, Inc.
    Inventors: Shiva Prakash, Srinivasan K. Ganapathi, Randolph S. Gluck, Steven H. Hovey
  • Patent number: 6889555
    Abstract: An alternate method of designing and manufacturing a semiconductor pressure sensor inherently allows for significantly improved sensitivity, thereby allowing miniaturization of the sensor. As a result, the design lends itself to arranging the pressure sensors using this method in a two dimensional array, and measuring pressure distributions with very high lateral resolution. Furthermore, the design eliminates some of the processing complexities associated with the designs taught in the prior art, specifically those related to processes for manufacturing the plates of the parallel plate capacitor, or the piezoresistive strain elements. The invention allows the manufacture a two dimensional array of pressure sensors with very fine lateral resolution, which provides a much improved means over the prior art of recording fingerprints and the like.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: May 10, 2005
    Assignee: Fidelica Microsystems, Inc.
    Inventor: Srinivasan K. Ganapathi