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).

  • DEVICES AND METHODS FOR SEQUENCING NUCLEIC ACIDS
    Publication number: 20130327645
    Abstract: Methods and devices for sequencing nucleic acids are disclosed herein. Devices are also provided herein for measuring DNA with nano-pores sized to allow DNA to pass through the nano-pore. The capacitance can be measured for the DNA molecule passing through the nano-pore. The capacitance measurements can be correlated to determine the sequence of base pairs passing through the nano-pore to sequence the DNA.
    Type: Application
    Filed: August 14, 2013
    Publication date: December 12, 2013
    Applicant: California Institute of Technology
    Inventors: Sameer Walavalkar, Axel Scherer, Thomas A. Tombrello, Aditya Rajagopal, Andrew P. Homyk, Erika Garcia
  • Electronic arrangements for passivated silicon nanowires
    Patent number: 8569741
    Abstract: Methods for fabricating passivated silicon nanowires and an electronic arrangement thus obtained are described. Such arrangements may comprise a metal-oxide-semiconductor (MOS) structure such that the arrangements may be utilized for MOS field-effect transistors (MOSFETs) or opto-electronic switches.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: October 29, 2013
    Assignee: California Institute of Technology
    Inventors: Axel Scherer, Sameer Walavalkar, Michael D. Henry, Andrew P. Homyk
  • Forming nanometer-sized patterns by electron microscopy
    Patent number: 8568605
    Abstract: A method for forming nanometer-sized patterns and pores in a membrane is described. The method comprises incorporating a reactive material onto the membrane, the reactive material being a material capable of lowering an amount of energy required for forming a pore and/or pattern by irradiating the membrane material with an electron beam, thus leading to a faster pore and/or pattern formation.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: October 29, 2013
    Assignee: California Institute of Technology
    Inventors: Sameer Walavalkar, Axel Scherer, Andrew P. Homyk
  • Devices and methods for sequencing nucleic acids
    Patent number: 8535512
    Abstract: Methods and devices for sequencing nucleic acids are disclosed herein. Devices are also provided herein for measuring DNA with nano-pores sized to allow DNA to pass through the nano-pore. The capacitance can be measured for the DNA molecule passing through the nano-pore. The capacitance measurements can be correlated to determine the sequence of base pairs passing through the nano-pore to sequence the DNA.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: September 17, 2013
    Assignee: California Institute of Technology
    Inventors: Sameer Walavalkar, Axel Scherer, Thomas A. Tombrello, Aditya Rajagopal, Andrew P. Homyk, Erika Garcia
  • ELECTRONIC ARRANGEMENTS FOR PASSIVATED SILICON NANOWIRES
    Publication number: 20120273762
    Abstract: Methods for fabricating passivated silicon nanowires and an electronic arrangement thus obtained are described. Such arrangements may comprise a metal-oxide-semiconductor (MOS) structure such that the arrangements may be utilized for MOS field-effect transistors (MOSFETs) or opto-electronic switches.
    Type: Application
    Filed: October 31, 2011
    Publication date: November 1, 2012
    Inventors: Axel SCHERER, Sameer WALAVALKAR, Michael D. HENRY, Andrew P. HOMYK
  • CHEMICAL SENSING AND/OR MEASURING DEVICES AND METHODS
    Publication number: 20120161207
    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: November 22, 2010
    Publication date: June 28, 2012
    Inventors: Andrew P. HOMYK, Michael D. Henry, Axel Scherer, Sameer Walavalkar
  • FORMING NANOMETER-SIZED PATTERNS BY ELECTRON MICROSCOPY
    Publication number: 20120152902
    Abstract: A method for forming nanometer-sized patterns and pores in a membrane is described. The method comprises incorporating a reactive material onto the membrane, the reactive material being a material capable of lowering an amount of energy required for forming a pore and/or pattern by irradiating the membrane material with an electron beam, thus leading to a faster pore and/or pattern formation.
    Type: Application
    Filed: November 17, 2011
    Publication date: June 21, 2012
    Inventors: Sameer WALAVALKAR, Axel SCHERER, Andrew P. HOMYK
  • DEVICES AND METHODS FOR SEQUENCING NUCLEIC ACIDS
    Publication number: 20120118739
    Abstract: Methods and devices for sequencing nucleic acids are disclosed herein. Devices are also provided herein for measuring DNA with nano-pores sized to allow DNA to pass through the nano-pore. The capacitance can be measured for the DNA molecule passing through the nano-pore. The capacitance measurements can be correlated to determine the sequence of base pairs passing through the nano-pore to sequence the DNA.
    Type: Application
    Filed: September 29, 2011
    Publication date: May 17, 2012
    Inventors: Sameer Walavalkar, Axel Scherer, Thomas A. Tombrello, Aditya Rajagopal, Andrew P. Homyk, Erika Garcia
  • PARTICULATE NANOSORTING STACK
    Publication number: 20120080361
    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: September 30, 2011
    Publication date: April 5, 2012
    Inventors: Sameer Walavalkar, Aditya Rajagopal, Axel Scherer, Thomas A. Tombrello
  • Methods for fabrication of high aspect ratio micropillars and nanopillars
    Patent number: 8148264
    Abstract: Methods for fabrication of high aspect ratio micropillars and nanopillars are described. Use of alumina as an etch mask for the fabrication methods is also described. The resulting micropillars and nanopillars are analyzed and a characterization of the etch mask is provided.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: April 3, 2012
    Assignee: California Institue of Technology
    Inventors: Michael D. Henry, Andrew P. Homyk, Axel Scherer, Sameer Walavalkar
  • Autonomous electrochemical actuation of microfluidic circuits
    Patent number: 8100672
    Abstract: A microfluidic structure with an electrically controlled pressure source is shown. The pressure source is an electrolyte connected with electrodes. Dissociation of the electrolyte generates the pressure, which is used to obtain a valve-like or pump-like behavior inside the microfluidic structure. A process for manufacturing the microfluidic structure and a method to circulate fluids in a microfluidic channel are also described.
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: January 24, 2012
    Assignee: California Institute of Technology
    Inventors: Sameer Walavalkar, Axel Scherer
  • Methods for fabricating passivated silicon nanowires and devices thus obtained
    Patent number: 8080468
    Abstract: Methods for fabricating passivated silicon nanowires and an electronic arrangement thus obtained are described. Such arrangements may comprise a metal-oxide-semiconductor (MOS) structure such that the arrangements may be utilized for MOS field-effect transistors (MOSFETs) or opto-electronic switches.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: December 20, 2011
    Assignee: California Institute of Technology
    Inventors: Axel Scherer, Sameer Walavalkar, Michael D. Henry, Andrew P. Homyk
  • METHODS FOR FABRICATING SELF-ALIGNING ARRANGEMENTS ON SEMICONDUCTORS
    Publication number: 20110140085
    Abstract: Methods for fabricating self-aligned heterostructures and semiconductor arrangements using silicon nanowires are described.
    Type: Application
    Filed: November 18, 2010
    Publication date: June 16, 2011
    Inventors: Andrew P. Homyk, Michael D. Henry, Axel Scherer, Sameer Walavalkar
  • METHODS FOR FABRICATING PASSIVATED SILICON NANOWIRES AND DEVICES THUS OBTAINED
    Publication number: 20110031470
    Abstract: Methods for fabricating passivated silicon nanowires and an electronic arrangement thus obtained are described. Such arrangements may comprise a metal-oxide-semiconductor (MOS) structure such that the arrangements may be utilized for MOS field-effect transistors (MOSFETs) or opto-electronic switches.
    Type: Application
    Filed: June 23, 2010
    Publication date: February 10, 2011
    Inventors: Axel Scherer, Sameer Walavalkar, Michael D. Henry, Andrew P. Homyk
  • METHODS FOR FABRICATION OF HIGH ASPECT RATIO MICROPILLARS AND NANOPILLARS
    Publication number: 20100213579
    Abstract: Methods for fabrication of high aspect ratio micropillars and nanopillars are described. Use of alumina as an etch mask for the fabrication methods is also described. The resulting micropillars and nanopillars are analyzed and a characterization of the etch mask is provided.
    Type: Application
    Filed: February 24, 2010
    Publication date: August 26, 2010
    Inventors: Michael D. Henry, Andrew P. Homyk, Axel Scherer, Sameer Walavalkar
  • METHODS FOR FABRICATING HIGH ASPECT RATIO PROBES AND DEFORMING HIGH ASPECT RATIO NANOPILLARS AND MICROPILLARS
    Publication number: 20100215543
    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: February 24, 2010
    Publication date: August 26, 2010
    Inventors: Michael D. HENRY, Andrew P. Homyk, Axel Scherer, Thomas A. Tombrello, Sameer Walavalkar
  • AUTONOMOUS ELECTROCHEMICAL ACTUATION OF MICROFLUIDIC CIRCUITS
    Publication number: 20090260692
    Abstract: A microfluidic structure with an electrically controlled pressure source is shown. The pressure source is an electrolyte connected with electrodes. Dissociation of the electrolyte generates the pressure, which is used to obtain a valve-like or pump-like behavior inside the microfluidic structure. A process for manufacturing the microfluidic structure and a method to circulate fluids in a microfluidic channel are also described.
    Type: Application
    Filed: January 6, 2009
    Publication date: October 22, 2009
    Inventors: Sameer WALAVALKAR, Axel Scherer