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: 20220322914Abstract: 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: ApplicationFiled: September 9, 2020Publication date: October 13, 2022Inventors: Abhijit Chandra, Ravita Srivastava
-
Patent number: 9624591Abstract: 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: GrantFiled: October 6, 2015Date of Patent: April 18, 2017Assignee: Actus Potentia, Inc.Inventors: Ambar K. Mitra, Ashraf F. Bastawros, Abhijit Chandra, Charles A. Lemaire
-
Publication number: 20160299265Abstract: 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: ApplicationFiled: November 17, 2014Publication date: October 13, 2016Applicant: INDIAN INSTITUTE OF TECHNOLOGY KANPURInventors: Animangsu GHATAK, Abhijit Chandra ROY
-
Publication number: 20160090660Abstract: 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: ApplicationFiled: October 6, 2015Publication date: March 31, 2016Inventors: Ambar K. Mitra, Ashraf F. Bastawros, Abhijit Chandra, Charles A. Lemaire
-
Patent number: 9150979Abstract: 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: GrantFiled: December 31, 2013Date of Patent: October 6, 2015Assignee: Actus Potentia, Inc.Inventors: Ambar K. Mitra, Ashraf F. Bastawros, Abhijit Chandra, Charles A. Lamaire
-
Patent number: 8683803Abstract: 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: GrantFiled: January 24, 2008Date of Patent: April 1, 2014Inventors: Ashraf F. Bastawros, Abhijit Chandra, Tom I-Ping Shih
-
Patent number: 8617378Abstract: 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: GrantFiled: August 16, 2011Date of Patent: December 31, 2013Assignee: Actus Potentia, Inc.Inventors: Ambar K. Mitra, Ashraf F. Bastawros, Abhijit Chandra, Charles A. Lemaire
-
Patent number: 8112384Abstract: 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: GrantFiled: October 25, 2005Date of Patent: February 7, 2012Assignee: Actus Potentia, Inc.Inventors: Ambar K. Mitra, Abhijit Chandra, Craig D. Herreman, Joel P. Dunham
-
Patent number: 7998323Abstract: 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: GrantFiled: June 7, 2007Date of Patent: August 16, 2011Assignee: Actus Potentia, Inc.Inventors: Abhijit Chandra, Ashraf F. Bastawros, Ambar K. Mitra, Charles A. Lemaire
-
Publication number: 20110111381Abstract: 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: ApplicationFiled: January 10, 2011Publication date: May 12, 2011Applicant: ACTUS POTENTIA, INC.Inventors: Ambar K. Mitra, Abhijit Chandra, Craig D. Herreman, Joel P. Dunham, Robert E. Harris, Dipayan Mitra
-
Patent number: 7544617Abstract: 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: GrantFiled: June 23, 2006Date of Patent: June 9, 2009Assignee: Iowa State University Research Foundation, Inc.Inventors: Abhijit Chandra, Muthukkumar Kadavasal, Sutee Eamkajornsiri
-
Publication number: 20080245068Abstract: 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: ApplicationFiled: January 24, 2008Publication date: October 9, 2008Inventors: ASHRAF F. BASTAWROS, ABHIJIT CHANDRA, TOM I-PING SHIH
-
Publication number: 20070190515Abstract: 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: ApplicationFiled: January 23, 2007Publication date: August 16, 2007Applicant: ACTUS POTENTIA, INC.Inventors: Ambar Mitra, Abhijit Chandra, Craig Herreman, Joel Dunham, Robert Harris, Dipayan Mitra
-
Publication number: 20060095474Abstract: 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: ApplicationFiled: October 25, 2005Publication date: May 4, 2006Inventors: Ambar Mitra, Abhijit Chandra, Craig Herreman, Joel Dunham
-
Patent number: 6343502Abstract: 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: GrantFiled: August 3, 1998Date of Patent: February 5, 2002Assignee: Michigan Technological UniversityInventors: Ghatu Subhash, Abhijit Chandra, Brian J. Koeppel