Patents Assigned to Indian Institute of Technology Madras
  • Patent number: 8519489
    Abstract: An embodiment relates a method comprising creating a reversible change in an electrical property by adsorption of a gas by a composition, wherein the composition comprises a noble metal-containing nanoparticle and a single walled carbon nanotube. Another embodiment relates to a method comprising forming a composition comprising a noble metal-containing nanoparticle and a single walled carbon nanotube and forming a device containing the said composition. Yet another method relates to a device comprising a composition comprising a noble metal-containing nanoparticle and a single walled carbon nanotube on a silicon wafer, wherein the composition exhibits a reversible change in an electrical property by adsorption of a gas by the composition.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: August 27, 2013
    Assignee: Indian Institute of Technology Madras
    Inventors: Pradeep Thalappil, Chandramouli Subramaniam
  • Publication number: 20130153924
    Abstract: Methods for fabricating a piezoelectric device are provided. The methods can include providing a substrate and forming a nanocrystalline diamond layer on a first surface of the substrate. The methods can also include depositing a piezoelectric layer on a first surface of the nanocrystalline diamond layer.
    Type: Application
    Filed: December 20, 2011
    Publication date: June 20, 2013
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRAS
    Inventors: Maneesh Chandran, M.S. Ramachandra Rao
  • Patent number: 8431037
    Abstract: An embodiment relates to a liquid composite dielectric material (LCDM) comprising a metal-containing dispersed phase material in an organic liquid phase material, wherein the liquid composite dielectric material has a dielectric permittivity (?r) of 10000 or more at 40 Hz and a dielectric loss (tan ?) of 1 or less at 40 Hz.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: April 30, 2013
    Assignee: Indian Institute of Technology Madras
    Inventors: Sri Ramachandra Rao Mamidanna, Ramachandran Balakrishnan
  • Publication number: 20130102460
    Abstract: Nanocomposite adsorbent materials and methods for their preparation and use are described. As an example, a polyaniline-graphite nanoplatelet nanocomposite may be used to adsorb carbon dioxide.
    Type: Application
    Filed: December 19, 2011
    Publication date: April 25, 2013
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRAS
    Inventors: Sundara Ramaprabhu, Ashish Kumar Mishra
  • Publication number: 20130070057
    Abstract: A method for generating an image is provided. The method includes estimating a high resolution image from a plurality of low resolution images and downsampling the estimated high resolution image to obtain estimates of a plurality of low resolution images. The method also includes generating a desired high resolution image based upon comparison of the downsampled low resolution images and the plurality of low resolution images.
    Type: Application
    Filed: November 14, 2012
    Publication date: March 21, 2013
    Applicant: Indian Institute of Technology Madras
    Inventor: Indian Institute of Technology Madras,
  • Patent number: 8395152
    Abstract: A method is provided for growing a stable p-type ZnO thin film with low resistivity and high mobility. The method includes providing an n-type Li—Ni co-doped ZnO target in a chamber, providing a substrate in the chamber, and ablating the target to form the thin film on the substrate.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: March 12, 2013
    Assignee: Indian Institute of Technology Madras
    Inventors: M. S. Ramachandra Rao, E. Senthil Kumar
  • Publication number: 20130056346
    Abstract: Methods for converting graphite oxide into graphene by exposure to electromagnetic radiation are described. As an example, graphene oxide may be rapidly converted into graphene upon exposure to converged sunlight.
    Type: Application
    Filed: September 6, 2011
    Publication date: March 7, 2013
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRAS
    Inventors: Ramaprabhu SUNDARA, Eswaraiah VARRLA, Jyothirmayee Aravind SASIDHARANNAIR SASIKALADEVI
  • Patent number: 8358833
    Abstract: A system and method for generating a focused image of an object is provided. The method comprises obtaining a plurality of images of an object, estimating an initial depth profile of the object, estimating a parallax parameter and a blur parameter for each pixel in of the plurality of images and generating a focused image and a corrected depth profile of the object using a posterior energy function. The posterior energy function is based on the estimated parallax parameter and the blur parameter of each pixel in the plurality of images.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: January 22, 2013
    Assignee: Indian Institute of Technology Madras
    Inventors: Rajiv Ranjan Sahay, Rajagopalan Ambasamudram Narayanan
  • Patent number: 8339470
    Abstract: A method for generating an image is provided. The method includes estimating a high resolution image from a plurality of low resolution images and downsampling the estimated high resolution image to obtain estimates of a plurality of low resolution images. The method also includes generating a desired high resolution image based upon comparison of the downsampled low resolution images and the plurality of low resolution images.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: December 25, 2012
    Assignee: Indian Institute of Technology Madras
    Inventors: Rajagopalan Ambasamudram Narayanan, Arnav Vinayak Bhavsar
  • Publication number: 20120299917
    Abstract: Methods and systems for modeling a porous physical object for layered manufacturing are provided. A model of an object includes geometric and material porosity models, each of which are divided into two-dimensional layer representations. Each two-dimensional layer represents a cross-section of the geometric model and material porosity model of the object, respectfully. The material porosity layer representations specify a material porosity variation for the layer. Geometric and material porosity contours of the model are created by iso-Z surface extraction for each layer. Using the contours, a boundary constrained line representation of each two-dimensional layer representation is generated using continuous space-filling fractal curves to characterize the material porosity variation for each two-dimensional layer.
    Type: Application
    Filed: August 1, 2012
    Publication date: November 29, 2012
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRAS
    Inventor: Gurunathan Saravana Kumar
  • Patent number: 8294306
    Abstract: Methods and devices for balancing voltages of capacitors in an electronic circuit are provided. The device includes a chopper circuit having a chopper inductor. Further, the chopper circuit may detect voltages across capacitors as well as an output current of the electronic circuit. In addition, the device may include a chopper control unit receiving the output current then generating a signal representing charging of the chopper inductor based on the output current. Also, the chopper control unit may receive the voltages across the capacitors and detect an imbalance between the voltages based on a polarity of the output current. Additionally, the chopper control unit may transfer of charge between the two capacitors, using the chopper inductor. Further, the chopper inductor is substantially discharged, during the transfer of charge between the capacitors.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: October 23, 2012
    Assignee: Indian Institute of Technology Madras
    Inventors: Mahesh Kumar, Srikanthan Sridharan, Jaganath Krishnan
  • Patent number: 8268359
    Abstract: An embodiment relates to a composition comprising a noble-metal containing nanoparticle and a polymer located on a surface of the nanoparticle, wherein the polymer is a polycondensation product of a halogenated monomer. Other embodiments relate to the method of making a composition and providing antimicrobial treatment using the composition.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: September 18, 2012
    Assignee: Indian Institute of Technology Madras
    Inventors: Thalappil Pradeep, A. Sreekumaran Nair
  • Patent number: 8260589
    Abstract: Methods and systems for modeling a porous physical object for layered manufacturing are provided. A model of an object includes geometric and material porosity models, each of which are divided into two-dimensional layer representations. Each two-dimensional layer represents a cross-section of the geometric model and material porosity model of the object, respectfully. The material porosity layer representations specify a material porosity variation for the layer. Geometric and material porosity contours of the model are created by iso-Z surface extraction for each layer. Using the contours, a boundary constrained line representation of each two-dimensional layer representation is generated using continuous space-filling fractal curves to characterize the material porosity variation for each two-dimensional layer.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: September 4, 2012
    Assignee: Indian Institute of Technology Madras
    Inventor: Gurunathan Saravana Kumar
  • Patent number: 8191126
    Abstract: Methods, devices, and systems are presented that facilitate pattern-based user authentication. In a first embodiment, a user may request registration from an authentication server. The authentication server may provide at least one image to the user, wherein the image may comprise a matrix of cells. The user may choose a sequence of cells in the matrix as his or her secret, and may provide a userid and this secret to the authentication server. The authentication server may then validate and store the userid and/or secret. After this registration step, the user may request authentication from the authentication server. The authentication server may provide another image of a matrix of cells to the user. The user may then enter a sequence of symbols associated the sequence of cells that comprise his or her secret. The authentication server may compare the entered sequence of cells to the sequence of cells represented by the stored secret. If the two sequences match, then the user may be authenticated.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: May 29, 2012
    Assignee: Indian Institute of Technology Madras
    Inventor: Serugudi Venkata Raghavan
  • Patent number: 8187976
    Abstract: A method is provided for growing a stable p-type ZnO thin film with low resistivity and high mobility. The method includes providing an n-type Li—Ni co-doped ZnO target in a chamber, providing a substrate in the chamber, and ablating the target to form the thin film on the substrate.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: May 29, 2012
    Assignee: Indian Institute of Technology Madras
    Inventors: M. S. Ramachandra Rao, E. Senthil Kumar
  • Publication number: 20110262030
    Abstract: A system and method for generating a focused image of an object is provided. The method comprises obtaining a plurality of images of an object, estimating an initial depth profile of the object, estimating a parallax parameter and a blur parameter for each pixel in of the plurality of images and generating a focused image and a corrected depth profile of the object using a posterior energy function. The posterior energy function is based on the estimated parallax parameter and the blur parameter of each pixel in the plurality of images.
    Type: Application
    Filed: April 27, 2010
    Publication date: October 27, 2011
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRAS
    Inventors: Rajiv Ranjan Sahay, Rajagopalan Ambasamudram Narayanan
  • Publication number: 20110227422
    Abstract: Methods and devices for balancing voltages of capacitors in an electronic circuit are provided. The device includes a chopper circuit having a chopper inductor. Further, the chopper circuit may detect voltages across capacitors as well as an output current of the electronic circuit. In addition, the device may include a chopper control unit receiving the output current then generating a signal representing charging of the chopper inductor based on the output current. Also, the chopper control unit may receive the voltages across the capacitors and detect an imbalance between the voltages based on a polarity of the output current. Additionally, the chopper control unit may transfer of charge between the two capacitors, using the chopper inductor. Further, the chopper inductor is substantially discharged, during the transfer of charge between the capacitors.
    Type: Application
    Filed: March 16, 2010
    Publication date: September 22, 2011
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRAS
    Inventors: Mahesh Kumar, Srikanthan Sridharan, Jaganath Krishnan
  • Publication number: 20110128394
    Abstract: A method for generating an image is provided. The method includes estimating a high resolution image from a plurality of low resolution images and downsampling the estimated high resolution image to obtain estimates of a plurality of low resolution images. The method also includes generating a desired high resolution image based upon comparison of the downsampled low resolution images and the plurality of low resolution images.
    Type: Application
    Filed: November 30, 2009
    Publication date: June 2, 2011
    Applicant: Indian Institute of Technology Madras
    Inventors: Rajagopalan Ambasamudram Narayanan, Arnav Vinayak Bhavsar
  • Publication number: 20110085282
    Abstract: An embodiment relates to a liquid composite dielectric material (LCDM) comprising a metal-containing dispersed phase material in an organic liquid phase material, wherein the liquid composite dielectric material has a dielectric permittivity (?r) of 10000 or more at 40 Hz and a dielectric loss (tan ?) of 1 or less at 40 Hz.
    Type: Application
    Filed: December 23, 2009
    Publication date: April 14, 2011
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRAS
    Inventors: Ramachandra M.S. RAO, Ramachandran B.
  • Publication number: 20110052714
    Abstract: An embodiment relates to a composition comprising a noble-metal containing nanoparticle and a polymer located on a surface of the nanoparticle, wherein the polymer is a polycondensation product of a halogenated monomer. Other embodiments relate to the method of making a composition and providing antimicrobial treatment using the composition.
    Type: Application
    Filed: December 16, 2009
    Publication date: March 3, 2011
    Applicant: Indian Institute of Technology Madras
    Inventors: Pradeep Thalappil, Sreekumaran Nair Appukuttan Nair