Patents by Inventor Sameer Walavalkar

Sameer Walavalkar 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: 20160158724
    Abstract: Methods for fabricating flexible substrate nanostructured devices are disclosed. The nanostructures comprise nano-pillars and metallic bulbs or nano-apertures. The nanostructures can be functionalized to detect biological entities. The flexible substrates can be rolled into cylindrical tubes for detection of fluidic samples.
    Type: Application
    Filed: November 25, 2015
    Publication date: June 9, 2016
    Inventors: Chieh-feng CHANG, Sameer WALAVALKAR, Scott E. FRASER, Axel SCHERER
  • Publication number: 20160069810
    Abstract: Methods and systems for nanopillar sensors are described. Nanopillars can be defined on a substrate, and metal deposited on the nanopillars. A thermal treatment can reflow the metal on the nanopillars forming metallic bulbs on the top end of the nanopillars. These structures can have enhanced optical detection when functionalized with biological agents, or can detect gases, particles and liquids through interaction with the metal layer on the nanopillars.
    Type: Application
    Filed: February 12, 2015
    Publication date: March 10, 2016
    Inventors: Sameer WALAVALKAR, Axel SCHERER, Thomas A. TOMBRELLO
  • Publication number: 20160067666
    Abstract: Methods and systems for nanopillar sensors are described. Nanopillars can be defined on a substrate, and metal deposited on the nanopillars. A thermal treatment can reflow the metal on the nanopillars forming metallic bulbs on the top end of the nanopillars. These structures can have enhanced optical detection when functionalized with biological agents, or can detect gases, particles and liquids through interaction with the metal layer on the nanopillars.
    Type: Application
    Filed: February 12, 2015
    Publication date: March 10, 2016
    Inventors: Sameer WALAVALKAR, Axel SCHERER
  • Patent number: 9243277
    Abstract: The basic structure and functionality of a probe as disclosed herein allows for flexibly incorporating into the probe, various sensing elements for various sensing applications. Two example applications among these various sensing applications include bio-sensing and chemical-sensing applications. For bio-sensing applications the probe, which is fabricated upon a silicon substrate, includes a bio-sensing element such as a nano-pillar transistor, and for chemical-sensing applications the probe includes a sensing element that has a functionalized contact area whereby the sensing element generates a voltage when exposed to one or more chemicals of interest.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: January 26, 2016
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Aditya Rajagopal, Axel Scherer, Michael D. Henry, Sameer Walavalkar, Thomas A. Tombrello, Andrew P. Homyk
  • Patent number: 9234872
    Abstract: Methods for fabricating silicon nanowire chemical sensing devices, devices thus obtained, and methods for utilizing devices for sensing and measuring chemical concentration of selected species in a fluid are described. Devices may comprise a metal-oxide-semiconductor field-effect transistor (MOSFET) structure.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: January 12, 2016
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Andrew P. Homyk, Michael D. Henry, Axel Scherer, Sameer Walavalkar
  • Publication number: 20150299757
    Abstract: The basic structure and functionality of a probe as disclosed herein allows for flexibly incorporating into the probe, various sensing elements for various sensing applications. Two example applications among these various sensing applications include bio-sensing and chemical-sensing applications. For bio-sensing applications the probe, which is fabricated upon a silicon substrate, includes a bio-sensing element such as a nano-pillar transistor, and for chemical-sensing applications the probe includes a sensing element that has a functionalized contact area whereby the sensing element generates a voltage when exposed to one or more chemicals of interest.
    Type: Application
    Filed: June 29, 2015
    Publication date: October 22, 2015
    Inventors: Aditya RAJAGOPAL, Axel SCHERER, Michael D. HENRY, Sameer WALAVALKAR, Thomas A. TOMBRELLO, Andrew P. HOMYK
  • Publication number: 20150283513
    Abstract: Methods and devices for isolating and sorting nanoparticles are disclosed herein. Nanopores of a desired size can be formed in silicon dioxide membranes and used as filters to separate nanoparticles. Devices are also provided herein for sorting nanoparticles with multiple filters having various sized nanopores.
    Type: Application
    Filed: June 19, 2015
    Publication date: October 8, 2015
    Inventors: SAMEER WALAVALKAR, ADITYA RAJAGOPAL, AXEL SCHERER, THOMAS A. TOMBRELLO
  • Publication number: 20150268191
    Abstract: Methods for fabricating silicon nanowire chemical sensing devices, devices thus obtained, and methods for utilizing devices for sensing and measuring chemical concentration of selected species in a fluid are described. Devices may comprise a metal-oxide-semiconductor field-effect transistor (MOSFET) structure.
    Type: Application
    Filed: March 30, 2015
    Publication date: September 24, 2015
    Inventors: Andrew P. HOMYK, Michael D. HENRY, Axel SCHERER, Sameer WALAVALKAR
  • Publication number: 20150223738
    Abstract: Methods and systems for nanopillar sensors are described. Nanopillars can be defined on a substrate, and metal deposited on the nanopillars. A thermal treatment can reflow the metal on the nanopillars forming metallic bulbs on the top end of the nanopillars. These structures can have enhanced optical detection when functionalized with biological agents, or can detect gases, particles and liquids through interaction with the metal layer on the nanopillars.
    Type: Application
    Filed: February 12, 2015
    Publication date: August 13, 2015
    Inventors: Sameer WALAVALKAR, Chieh-feng CHANG, Axel SCHERER
  • Publication number: 20150223739
    Abstract: Methods and systems for nanopillar sensors are described. Nanopillars can be defined on a substrate, and metal deposited on the nanopillars. A thermal treatment can reflow the metal on the nanopillars forming metallic bulbs on the top end of the nanopillars. These structures can have enhanced optical detection when functionalized with biological agents, or can detect gases, particles and liquids through interaction with the metal layer on the nanopillars.
    Type: Application
    Filed: February 12, 2015
    Publication date: August 13, 2015
    Inventors: Sameer WALAVALKAR, Chieh-feng CHANG, Axel SCHERER, Brandon MARIN, Scott E. FRASER
  • Patent number: 9099436
    Abstract: The basic structure and functionality of a probe as disclosed herein allows for flexibly incorporating into the probe, various sensing elements for various sensing applications. Two example applications among these various sensing applications include bio-sensing and chemical-sensing applications. For bio-sensing applications the probe, which is fabricated upon a silicon substrate, includes a bio-sensing element such as a nano-pillar transistor, and for chemical-sensing applications the probe includes a sensing element that has a functionalized contact area whereby the sensing element generates a voltage when exposed to one or more chemicals of interest.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: August 4, 2015
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Aditya Rajagopal, Axel Scherer, Michael D. Henry, Sameer Walavalkar, Thomas A. Tombrello, Andrew P. Homyk
  • Patent number: 9089819
    Abstract: Methods and devices for isolating and sorting nanoparticles are disclosed herein. Nanopores of a desired size can be formed in silicon dioxide membranes and used as filters to separate nanoparticles. Devices are also provided herein for sorting nanoparticles with multiple filters having various sized nanopores.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: July 28, 2015
    Assignee: California Institute of Technology
    Inventors: Sameer Walavalkar, Aditya Rajagopal, Axel Scherer, Thomas A. Tombrello
  • Patent number: 9018684
    Abstract: Methods for fabricating silicon nanowire chemical sensing devices, devices thus obtained, and methods for utilizing devices for sensing and measuring chemical concentration of selected species in a fluid are described. Devices may comprise a metal-oxide-semiconductor field-effect transistor (MOSFET) structure.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: April 28, 2015
    Assignee: California Institute of Technology
    Inventors: Andrew P. Homyk, Michael D. Henry, Axel Scherer, Sameer Walavalkar
  • Patent number: 9005548
    Abstract: Methods for fabricating of high aspect ratio probes and deforming micropillars and nanopillars are described. Use of polymers in deforming nanopillars and micropillars is also described.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: April 14, 2015
    Assignee: California Institute of Technology
    Inventors: Michael D. Henry, Andrew P. Homyk, Axel Scherer, Thomas A. Tombrello, Sameer Walavalkar
  • Publication number: 20150050746
    Abstract: Methods for fabricating of high aspect ratio probes and deforming micropillars and nanopillars are described. Use of polymers in deforming nanopillars and micropillars is also described.
    Type: Application
    Filed: October 29, 2014
    Publication date: February 19, 2015
    Inventors: Michael D. HENRY, Andrew P. HOMYK, Axel SCHERER, Thomas A. TOMBRELLO, Sameer WALAVALKAR
  • Publication number: 20140357974
    Abstract: A field effect nano-pillar transistor has a pillar shaped gate element incorporating a biomimitec portion that provides various advantages over prior art devices. The small size of the nano-pillar transistor allows for advantageous insertion into cellular membranes, and the biomimitec character of the gate element operates as an advantageous interface for sensing small amplitude voltages such as transmembrane cell potentials. The nano-pillar transistor can be used in various embodiments to stimulate cells, to measure cell response, or to perform a combination of both actions.
    Type: Application
    Filed: August 19, 2014
    Publication date: December 4, 2014
    Inventors: Aditya RAJAGOPAL, Axel SCHERER, Michael D. HENRY, Sameer WALAVALKAR, Thomas A. TOMBRELLO, Andrew P. HOMYK
  • Publication number: 20140319459
    Abstract: Methods for fabricating self-aligned heterostructures and semiconductor arrangements using silicon nanowires are described.
    Type: Application
    Filed: July 11, 2014
    Publication date: October 30, 2014
    Inventors: Andrew P. HOMYK, Michael D. HENRY, Axel SCHERER, Sameer WALAVALKAR
  • Patent number: 8841712
    Abstract: A field effect nano-pillar transistor has a pillar shaped gate element incorporating a biomimitec portion that provides various advantages over prior art devices. The small size of the nano-pillar transistor allows for advantageous insertion into cellular membranes, and the biomimitec character of the gate element operates as an advantageous interface for sensing small amplitude voltages such as transmembrane cell potentials. The nano-pillar transistor can be used in various embodiments to stimulate cells, to measure cell response, or to perform a combination of both actions.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: September 23, 2014
    Assignee: California Institute of Technology
    Inventors: Aditya Rajagopal, Axel Scherer, Michael D. Henry, Sameer Walavalkar, Thomas A. Tombrello, Andrew P. Homyk
  • Publication number: 20140256114
    Abstract: Novel methods to fabricate biological sensors and electronics are disclosed. A silicon-on-insulator wafer can be employed by etching a pattern of holes in the silicon layer, then a pattern of cavities in the insulating layer, and then sealing the top of the cavities. Further, n or p doped regions and metallic regions can be defined in the processed wafer, thereby enabling integration of biological sensing and electronic capabilities in the same wafer.
    Type: Application
    Filed: February 21, 2014
    Publication date: September 11, 2014
    Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Sameer WALAVALKAR, Mark D. GOLDBERG, Axel SCHERER
  • Patent number: 8809093
    Abstract: Methods for fabricating self-aligned heterostructures and semiconductor arrangements using silicon nanowires are described.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: August 19, 2014
    Assignee: California Institute of Technology
    Inventors: Andrew P. Homyk, Michael D. Henry, Axel Scherer, Sameer Walavalkar