Patents Assigned to Indian Institute of Technology Madras
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Patent number: 8519489Abstract: 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: GrantFiled: December 15, 2009Date of Patent: August 27, 2013Assignee: Indian Institute of Technology MadrasInventors: Pradeep Thalappil, Chandramouli Subramaniam
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Publication number: 20130153924Abstract: 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: ApplicationFiled: December 20, 2011Publication date: June 20, 2013Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRASInventors: Maneesh Chandran, M.S. Ramachandra Rao
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Patent number: 8431037Abstract: 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: GrantFiled: December 23, 2009Date of Patent: April 30, 2013Assignee: Indian Institute of Technology MadrasInventors: Sri Ramachandra Rao Mamidanna, Ramachandran Balakrishnan
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Publication number: 20130102460Abstract: 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: ApplicationFiled: December 19, 2011Publication date: April 25, 2013Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRASInventors: Sundara Ramaprabhu, Ashish Kumar Mishra
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Publication number: 20130070057Abstract: 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: ApplicationFiled: November 14, 2012Publication date: March 21, 2013Applicant: Indian Institute of Technology MadrasInventor: Indian Institute of Technology Madras,
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Patent number: 8395152Abstract: 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: GrantFiled: April 17, 2012Date of Patent: March 12, 2013Assignee: Indian Institute of Technology MadrasInventors: M. S. Ramachandra Rao, E. Senthil Kumar
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Publication number: 20130056346Abstract: 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: ApplicationFiled: September 6, 2011Publication date: March 7, 2013Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRASInventors: Ramaprabhu SUNDARA, Eswaraiah VARRLA, Jyothirmayee Aravind SASIDHARANNAIR SASIKALADEVI
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Patent number: 8358833Abstract: 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: GrantFiled: April 27, 2010Date of Patent: January 22, 2013Assignee: Indian Institute of Technology MadrasInventors: Rajiv Ranjan Sahay, Rajagopalan Ambasamudram Narayanan
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Patent number: 8339470Abstract: 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: GrantFiled: November 30, 2009Date of Patent: December 25, 2012Assignee: Indian Institute of Technology MadrasInventors: Rajagopalan Ambasamudram Narayanan, Arnav Vinayak Bhavsar
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Publication number: 20120299917Abstract: 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: ApplicationFiled: August 1, 2012Publication date: November 29, 2012Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRASInventor: Gurunathan Saravana Kumar
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Patent number: 8294306Abstract: 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: GrantFiled: March 16, 2010Date of Patent: October 23, 2012Assignee: Indian Institute of Technology MadrasInventors: Mahesh Kumar, Srikanthan Sridharan, Jaganath Krishnan
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Patent number: 8268359Abstract: 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: GrantFiled: December 16, 2009Date of Patent: September 18, 2012Assignee: Indian Institute of Technology MadrasInventors: Thalappil Pradeep, A. Sreekumaran Nair
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Patent number: 8260589Abstract: 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: GrantFiled: December 24, 2009Date of Patent: September 4, 2012Assignee: Indian Institute of Technology MadrasInventor: Gurunathan Saravana Kumar
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Patent number: 8191126Abstract: 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: GrantFiled: May 4, 2009Date of Patent: May 29, 2012Assignee: Indian Institute of Technology MadrasInventor: Serugudi Venkata Raghavan
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Patent number: 8187976Abstract: 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: GrantFiled: December 21, 2009Date of Patent: May 29, 2012Assignee: Indian Institute of Technology MadrasInventors: M. S. Ramachandra Rao, E. Senthil Kumar
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Publication number: 20110262030Abstract: 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: ApplicationFiled: April 27, 2010Publication date: October 27, 2011Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRASInventors: Rajiv Ranjan Sahay, Rajagopalan Ambasamudram Narayanan
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Publication number: 20110227422Abstract: 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: ApplicationFiled: March 16, 2010Publication date: September 22, 2011Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRASInventors: Mahesh Kumar, Srikanthan Sridharan, Jaganath Krishnan
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Publication number: 20110128394Abstract: 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: ApplicationFiled: November 30, 2009Publication date: June 2, 2011Applicant: Indian Institute of Technology MadrasInventors: Rajagopalan Ambasamudram Narayanan, Arnav Vinayak Bhavsar
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Publication number: 20110085282Abstract: 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: ApplicationFiled: December 23, 2009Publication date: April 14, 2011Applicant: INDIAN INSTITUTE OF TECHNOLOGY MADRASInventors: Ramachandra M.S. RAO, Ramachandran B.
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Publication number: 20110052714Abstract: 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: ApplicationFiled: December 16, 2009Publication date: March 3, 2011Applicant: Indian Institute of Technology MadrasInventors: Pradeep Thalappil, Sreekumaran Nair Appukuttan Nair