Patents by Inventor Abhijit Chandra

Abhijit Chandra 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: 20220322914
    Abstract: An external endoluminal fixator device to fix rectal prolapse and/or vaginal and/or uterine and/or urinary bladder prolapse by passing through it, includes a head configured at distal end of the external endoluminal fixator device such that the head passes through an anorectum or a vagina of a body. The device then includes a hollow shaft connected with the head which is in angulation corresponding to usage in the anorectum or a sacral hollow or the vagina of the body and an endoluminal fixator device handle connected with the hollow shaft at proximal end of the external endoluminal fixator device, configured to remain outside of anus or vagina to have a sturdy grip so as to push up the head of the endoluminal fixator device either trans-anally or vaginally with the anorectum or the vagina against undersurface of the anterior abdominal wall.
    Type: Application
    Filed: September 9, 2020
    Publication date: October 13, 2022
    Inventors: Abhijit Chandra, Ravita Srivastava
  • Patent number: 9624591
    Abstract: Focused Electric Field Imprinting (FEFI) provides a focused electric field to guide an unplating operation and/or a plating operation to form very fine-pitched metal patterns on a substrate. The process is a variation of the electrochemical unplating process, wherein the process is modified for imprinting range of patterns of around 2000 microns to 20 microns or less in width, and from about 0.1 microns or less to 10 microns or more in depth. Some embodiments curve a proton-exchange membrane whose shape is varied using suction on a backing fluid through a support mask. Other embodiments use a curved electrode. Mask-membrane interaction parameters and process settings vary the feature size, which can generate sub-100-nm features. The feature-generation process is parallelized, and a stepped sequence of such FEFI operations, can generate sub-100-nm lines with sub-100-nm spacing. The described FEFI process is implemented on copper substrate, and also works well on other conductors.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: April 18, 2017
    Assignee: Actus Potentia, Inc.
    Inventors: Ambar K. Mitra, Ashraf F. Bastawros, Abhijit Chandra, Charles A. Lemaire
  • Publication number: 20160299265
    Abstract: Methods of forming a tunable focal length lens and an optical filter are disclosed. The tunable focal length lens may have varying focal lengths due to liquids within micro-channels which may cause varying cross-sectional areas of the micro-channels. The tunable focal length lens may have variable force. The tunable focal length lens may have a variable refractive index. The optical filter may have varying wavelengths due to dyes within the micro-channels. An apparatus incorporating an aspherical lens is also disclosed.
    Type: Application
    Filed: November 17, 2014
    Publication date: October 13, 2016
    Applicant: INDIAN INSTITUTE OF TECHNOLOGY KANPUR
    Inventors: Animangsu GHATAK, Abhijit Chandra ROY
  • Publication number: 20160090660
    Abstract: Focused Electric Field Imprinting (FEFI) provides a focused electric field to guide an unplating operation and/or a plating operation to form very fine-pitched metal patterns on a substrate. The process is a variation of the electrochemical unplating process, wherein the process is modified for imprinting range of patterns of around 2000 microns to 20 microns or less in width, and from about 0.1 microns or less to 10 microns or more in depth. Some embodiments curve a proton-exchange membrane whose shape is varied using suction on a backing fluid through a support mask. Other embodiments use a curved electrode. Mask-membrane interaction parameters and process settings vary the feature size, which can generate sub-100-nm features. The feature-generation process is parallelized, and a stepped sequence of such FEFI operations, can generate sub-100-nm lines with sub-100-nm spacing. The described FEFI process is implemented on copper substrate, and also works well on other conductors.
    Type: Application
    Filed: October 6, 2015
    Publication date: March 31, 2016
    Inventors: Ambar K. Mitra, Ashraf F. Bastawros, Abhijit Chandra, Charles A. Lemaire
  • Patent number: 9150979
    Abstract: Focused Electric Field Imprinting (FEFI) provides a focused electric field to guide an unplating operation and/or a plating operation to form very fine-pitched metal patterns on a substrate. The process is a variation of the electrochemical unplating process, wherein the process is modified for imprinting range of patterns of around 2000 microns to 20 microns or less in width, and from about 0.1 microns or less to 10 microns or more in depth. Some embodiments curve a proton-exchange membrane whose shape is varied using suction on a backing fluid through a support mask. Other embodiments use a curved electrode. Mask-membrane interaction parameters and process settings vary the feature size, which can generate sub-100-nm features. The feature-generation process is parallelized, and a stepped sequence of such FEFI operations, can generate sub-100-nm lines with sub-100-nm spacing. The described FEFI process is implemented on copper substrate, and also works well on other conductors.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: October 6, 2015
    Assignee: Actus Potentia, Inc.
    Inventors: Ambar K. Mitra, Ashraf F. Bastawros, Abhijit Chandra, Charles A. Lamaire
  • Patent number: 8683803
    Abstract: A method and apparatus for generating power which includes a phase-change media (PCM) that expands upon cooling contained within an expandable capsule if the phase change involves solidification (if phase change is solid-solid, then capsules are not needed), a carrier liquid that does not freeze in the operating temperature range, a heat exchanger, and an engine. Alternatively, the method and apparatus can include a PCM contained within a layer next to the walls of a constant volume container, a working liquid within the container that does not freeze in the operating temperature range, a heat exchanger, and an engine. In both cases, the engine denotes a device that converts the energy in the high-pressure liquid into electrical or mechanical power.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: April 1, 2014
    Inventors: Ashraf F. Bastawros, Abhijit Chandra, Tom I-Ping Shih
  • Patent number: 8617378
    Abstract: Focused Electric Field Imprinting (FEFI) provides a focused electric field to guide an unplating operation and/or a plating operation to form very fine-pitched metal patterns on a substrate. The process is a variation of the electrochemical unplating process, wherein the process is modified for imprinting range of patterns of around 2000 microns to 20 microns or less in width, and from about 0.1 microns or less to 10 microns or more in depth. Some embodiments curve a proton-exchange membrane whose shape is varied using suction on a backing fluid through a support mask. Other embodiments use a curved electrode. Mask-membrane interaction parameters and process settings vary the feature size, which can generate sub-100-nm features. The feature-generation process is parallelized, and a stepped sequence of such FEFI operations, can generate sub-100-nm lines with sub-100-nm spacing. The described FEFI process is implemented on copper substrate, and also works well on other conductors.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: December 31, 2013
    Assignee: Actus Potentia, Inc.
    Inventors: Ambar K. Mitra, Ashraf F. Bastawros, Abhijit Chandra, Charles A. Lemaire
  • Patent number: 8112384
    Abstract: The present invention provides a computer-implemented method of problem solving that includes graphically displaying a plurality of concepts, dynamic links between the concepts, and solving a problem based on the displayed concepts and dynamic links. Other embodiments include: a computer-readable medium having instructions thereon for causing a suitably programmed information-processing apparatus to perform a method of the problem solving that includes graphically displaying a plurality of concepts, displaying dynamic links between the concepts, and solving a problem based on the displayed concepts and dynamic links. Still other embodiments include a computerized apparatus that includes a display output unit, a display drive unit that causes a plurality of concepts to be displayed on the display unit, and that causes dynamic links between the concepts to be displayed, and a solution unit that solves a problem based on the displayed concepts and dynamic links, and that displays the solution.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: February 7, 2012
    Assignee: Actus Potentia, Inc.
    Inventors: Ambar K. Mitra, Abhijit Chandra, Craig D. Herreman, Joel P. Dunham
  • Patent number: 7998323
    Abstract: A Focused Electric Field Imprinting (FEFI) process and apparatus provides a focused electric field to guide an unplating operation and/or a plating operation to form very fine-pitched metal patterns on a substrate. The process is a variation of the electrochemical unplating process, wherein the process is modified for imprinting range of patterns of around 2000 microns to 20 microns or less in width, and from about 0.1 microns or less to 10 microns or more in depth. Some embodiments curve a proton-exchange membrane whose shape is varied using suction on a backing fluid through a support mask. Other embodiments use a curved electrode. Mask-membrane interaction parameters and process settings vary the feature size, which can generate sub-100-nm features. The feature-generation process is parallelized, and a stepped sequence of such FEFI operations, can generate sub-100 nm lines with sub-100 nm spacing. The described FEFI process is implemented on copper substrate, and also works well on other conductors.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: August 16, 2011
    Assignee: Actus Potentia, Inc.
    Inventors: Abhijit Chandra, Ashraf F. Bastawros, Ambar K. Mitra, Charles A. Lemaire
  • Publication number: 20110111381
    Abstract: The present invention provides a computer-implemented method of problem solving that includes graphically displaying a plurality of concepts, dynamic links between the concepts, and solving a problem based on the displayed concepts and dynamic links. Other embodiments include: a computer-readable medium having instructions thereon for causing a suitably programmed information-processing apparatus to perform a method of the problem solving that includes graphically displaying a plurality of concepts, displaying dynamic links between the concepts, and solving a problem based on the displayed concepts and dynamic links. Still other embodiments include a computerized apparatus that includes a display output unit, a display drive unit that causes a plurality of concepts to be displayed on the display unit, and that causes dynamic links between the concepts to be displayed, and a solution unit that solves a problem based on the displayed concepts and dynamic links, and that displays the solution.
    Type: Application
    Filed: January 10, 2011
    Publication date: May 12, 2011
    Applicant: ACTUS POTENTIA, INC.
    Inventors: Ambar K. Mitra, Abhijit Chandra, Craig D. Herreman, Joel P. Dunham, Robert E. Harris, Dipayan Mitra
  • Patent number: 7544617
    Abstract: A method for control of chemical mechanical polishing of a pattern dependant non-uniform wafer surfaces in a die scale wherein the die in the wafer surface have a plurality of zones of different heights and different pattern densities is provided. The method provides for varying pressure applied to the die both spatially and temporally to reduce both local and global step height variations. In one embodiment, pressure is varied both spatially and temporally using a look ahead algorithm. The algorithm looks ahead and recalculates/modifies the pressure values by identifying the step heights that could be formed after a specified time step. The final surface predictions have improved uniformity on the upper surface as well as on the step heights across the entire die.
    Type: Grant
    Filed: June 23, 2006
    Date of Patent: June 9, 2009
    Assignee: Iowa State University Research Foundation, Inc.
    Inventors: Abhijit Chandra, Muthukkumar Kadavasal, Sutee Eamkajornsiri
  • Publication number: 20080245068
    Abstract: A method and apparatus for generating power which includes a phase-change media (PCM) that expands upon cooling contained within an expandable capsule if the phase change involves solidification (if phase change is solid-solid, then capsules are not needed), a carrier liquid that does not freeze in the operating temperature range, a heat exchanger, and an engine. Alternatively, the method and apparatus can include a PCM contained within a layer next to the walls of a constant volume container, a working liquid within the container that does not freeze in the operating temperature range, a heat exchanger, and an engine. In both cases, the engine denotes a device that converts the energy in the high-pressure liquid into electrical or mechanical power.
    Type: Application
    Filed: January 24, 2008
    Publication date: October 9, 2008
    Inventors: ASHRAF F. BASTAWROS, ABHIJIT CHANDRA, TOM I-PING SHIH
  • Publication number: 20070190515
    Abstract: The present invention provides a computer-implemented method of problem solving that includes graphically displaying a plurality of concepts, dynamic links between the concepts, and solving a problem based on the displayed concepts and dynamic links. Other embodiments include: a computer-readable medium having instructions thereon for causing a suitably programmed information-processing apparatus to perform a method of the problem solving that includes graphically displaying a plurality of concepts, displaying dynamic links between the concepts, and solving a problem based on the displayed concepts and dynamic links. Still other embodiments include a computerized apparatus that includes a display output unit, a display drive unit that causes a plurality of concepts to be displayed on the display unit, and that causes dynamic links between the concepts to be displayed, and a solution unit that solves a problem based on the displayed concepts and dynamic links, and that displays the solution.
    Type: Application
    Filed: January 23, 2007
    Publication date: August 16, 2007
    Applicant: ACTUS POTENTIA, INC.
    Inventors: Ambar Mitra, Abhijit Chandra, Craig Herreman, Joel Dunham, Robert Harris, Dipayan Mitra
  • Publication number: 20060095474
    Abstract: The present invention provides a computer-implemented method of problem solving that includes graphically displaying a plurality of concepts, dynamic links between the concepts, and solving a problem based on the displayed concepts and dynamic links. Other embodiments include: a computer-readable medium having instructions thereon for causing a suitably programmed information-processing apparatus to perform a method of the problem solving that includes graphically displaying a plurality of concepts, displaying dynamic links between the concepts, and solving a problem based on the displayed concepts and dynamic links. Still other embodiments include a computerized apparatus that includes a display output unit, a display drive unit that causes a plurality of concepts to be displayed on the display unit, and that causes dynamic links between the concepts to be displayed, and a solution unit that solves a problem based on the displayed concepts and dynamic links, and that displays the solution.
    Type: Application
    Filed: October 25, 2005
    Publication date: May 4, 2006
    Inventors: Ambar Mitra, Abhijit Chandra, Craig Herreman, Joel Dunham
  • Patent number: 6343502
    Abstract: An apparatus and method for determining dynamic indentation hardness values of a material using a propagating stress wave to make an indentation in the material. The invention provides such values without any prior knowledge of the material properties and enables the dynamic indentation hardness values to be directly compared to static indentation hardness values for the material.
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: February 5, 2002
    Assignee: Michigan Technological University
    Inventors: Ghatu Subhash, Abhijit Chandra, Brian J. Koeppel