Patents by Inventor Ramaswamy Nagarajan

Ramaswamy Nagarajan 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: 20240098887
    Abstract: A flexible circuit module is disclosed. The flexible circuit module includes a fabric member including a plurality of fibers having non-conductive elements, and conductive elements oriented through the plane of the fabric. Each conductive element includes a first fiber element strand and a first unterminated end opposite the first fiber element strand, and a second fiber element strand having second unterminated end opposite the second fiber element strand. The fabric member further includes a first side with the first fiber element strands extending therefrom and a second side with second fiber element strands extending therefrom. A first hook-and-loop busbar is conductively connected to the first fiber element strands and a second hook-and-loop busbar is conductively connected to the second fiber element strands.
    Type: Application
    Filed: March 31, 2023
    Publication date: March 21, 2024
    Applicants: University of Massachusetts, U.S. Government
    Inventors: Ramaswamy NAGARAJAN, Jayant KUMAR, Ravi MOSURKAL, Siddhant IYER, Claire LEPONT, Lian LI
  • Patent number: 10845335
    Abstract: An electrochemical tongue can be used for detection of metal ions. The reference electrode of the electrochemical tongue can be coated with a polymer. More than one reference electrode can be used, and the electrochemical tongue can be inserted into a cone penetrometer for portable, in situ analysis.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: November 24, 2020
    Assignee: University of Massachusetts
    Inventors: Pradeep Kurup, Ramaswamy Nagarajan, Timothy Ponrathnam, Weeradech Kiratitanavit
  • Patent number: 10731040
    Abstract: A method of forming a crosslinked polyphenol, the method comprising: reacting a bio-based phenolic compound comprising at least one phenolic hydroxyl group, with a crosslinking agent comprising at least two functional groups reactive with the phenolic hydroxyl group, wherein the at least two functional groups are each independently a halogen group, acid halide group, sulfonyl halide group, glycidyl group, anhydride group, or a combination comprising at least one of the foregoing, to provide the crosslinked polyphenol.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: August 4, 2020
    Assignees: THE UNIVERSITY OF MASSACHUSETTS, THE GOVERNMENT OF THE UNITED STATES, REPRESENTED BY THE SECRETARY OF THE ARMY
    Inventors: Ramaswamy Nagarajan, Jayant Kumar, Ravi Mosurkal, Zhiyu Xia
  • Publication number: 20200056057
    Abstract: A synergistic flame retardant composition comprising a phenolic compound comprising condensed tannin, hydrolysable tannin, lignin, cardanol, quercetin, catechin, epicatechin, anthocyanidin, catechol, dopamine, hydroxytyrosol, adrenaline, 4-hydroxyphenylacetic acid, gallic acid, digallic acid, methyl gallate, ellagic acid, phloroglucinol, hexahydroxydiphenic acid, luteic acid, casuarictin, or a combination thereof; and a phosphorus-containing compound comprising a C5-7 carbocyclic polyol substituted with at least one phosphate group.
    Type: Application
    Filed: August 16, 2019
    Publication date: February 20, 2020
    Inventors: Ramaswamy Nagarajan, Jayant Kumar, Ravi Mosurkal, Zhiyu Xia, Shiran Yu, Weeradech Kiratitanavit
  • Publication number: 20180246059
    Abstract: An electrochemical tongue can be used for detection of metal ions. The reference electrode of the electrochemical tongue can be coated with a polymer. More than one reference electrode can be used, and the electrochemical tongue can be inserted into a cone penetrometer for portable, in situ analysis.
    Type: Application
    Filed: March 16, 2018
    Publication date: August 30, 2018
    Inventors: Pradeep Kurup, Ramaswamy Nagarajan, Timothy Ponrathnam, Weeradech Kiratitanavit
  • Publication number: 20180016445
    Abstract: A method of forming a crosslinked polyphenol, the method comprising: reacting a bio-based phenolic compound comprising at least one phenolic hydroxyl group, with a crosslinking agent comprising at least two functional groups reactive with the phenolic hydroxyl group, wherein the at least two functional groups are each independently a halogen group, acid halide group, sulfonyl halide group, glycidyl group, anhydride group, or a combination comprising at least one of the foregoing, to provide the crosslinked polyphenol.
    Type: Application
    Filed: July 12, 2017
    Publication date: January 18, 2018
    Inventors: Ramaswamy Nagarajan, Jayant Kumar, Ravi Mosurkal, Zhiyu Xia
  • Patent number: 9815912
    Abstract: A surfactant produced by reacting naturally occurring polysaccharides that are not water soluble with a hydrophilic substituent on a carboxylic portion of the polysaccharide. In a second reaction, the surfactant is further substituted on a hydroxylic portion with a hydrophobic or lipophilic substituent, so as to make the reaction product both water soluble and capable of attracting oily material that is hydrophobic to be removed from a substrate by cleaning in water. Methods of making the surfactant and the follow-on reaction product are described.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 14, 2017
    Assignee: University of Massachusetts
    Inventors: Zarif Farhana Mohd Aris, Ryan M. Bouldin, Ramaswamy Nagarajan, Bridgette Budhlall, Vishal Bavishi
  • Publication number: 20160025678
    Abstract: An electrochemical tongue can be used for detection of metal ions. The reference electrode of the electrochemical tongue can be coated with a polymer. More than one reference electrode can be used, and the electrochemical tongue can be inserted into a cone penetrometer for portable, in situ analysis.
    Type: Application
    Filed: April 3, 2014
    Publication date: January 28, 2016
    Inventors: Pradeep Kurup, Ramaswamy Nagarajan, Seth Robertson, Timothy Ponratham, Junghwan Cho, Weeradech Kiratitanavit
  • Publication number: 20150366074
    Abstract: Metal flakes, an organic metal precursor, an organic solvent and either no binder, or a volatile or a thermally decomposable binder are combined to form a paste. The paste is deposited in a circuit pattern on a substrate and the circuit pattern is cured. While curing, the organic metal precursor decomposes to leave an electrically conductive path, and the printed circuit is thus formed. A precursor to an electrically conductive circuit material includes an organic metal precursor, metal microparticles, and an organic solvent. The method can be employed to form printed circuits, for a variety of electrical, electronic and sensing application, such as crack detection in ceramic, plastics, concrete, wood, fabric, leather, rubber or paper and composite materials.
    Type: Application
    Filed: March 31, 2015
    Publication date: December 17, 2015
    Inventors: Ramaswamy Nagarajan, Sharavanan Balasubramanian, Julie Chen, Joey Mead
  • Patent number: 9080001
    Abstract: A chemical compound of structural formula (I) useful in preparation of flame retardant materials is disclosed. Homopolymer, and copolymers of a compound of formula (I), as well as methods of preparing said homo- and copolymers are also disclosed. Polymers described herein advantageous possess low heat release capacities and high char yields.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: July 14, 2015
    Assignee: University of Massachusetts
    Inventors: Jayant Kumar, E. Bryan Coughlin, Todd Emrick, Bon-Cheol Ku, Sethumadhavan Ravichandran, Subhalakshmi Nagarajan, Ramaswamy Nagarajan, Weeradech Kiratitanavit
  • Patent number: 9038483
    Abstract: Wireless strain and displacement sensors wirelessly monitor structural health and integrity, and are made by printing inductor-interdigital capacitor sensing circuits on a variety of substrates, including ceramic substrates, with thermally processable conductive inks. Sensors of the invention can be employed to detect strain and displacement of civil structures, such as bridges and buildings. The sensors include sensing elements that are mounted or printed on stiff, inflexible substrates, which prevent the sensing elements from bending, stretching, or otherwise warping when the sensor is strained. An interlayer between the sensing elements allows the sensing elements to move with respect to each other during application of strain. Thus, strain causes the sensing elements to move but not to deform, causing changes in sensor resonance that can be detected through wireless radio-frequency interrogation.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: May 26, 2015
    Assignee: University of Massachusetts
    Inventors: Ramaswamy Nagarajan, Jungrae Park, Sharavanan Balasubramaniam, Mario J. Cazeca, Shivshankar Sivasubramanian, Joey Mead, Julie Chen
  • Patent number: 8999431
    Abstract: Metal flakes, an organic metal precursor, an organic solvent and either no binder, or a volatile or a thermally decomposable binder are combined to form a paste. The paste is deposited in a circuit pattern on a substrate and the circuit pattern is cured. While curing, the organic metal precursor decomposes to leave an electrically conductive path, and the printed circuit is thus formed. A precursor to an electrically conductive circuit material includes an organic metal precursor, metal microparticles, and an organic solvent. The method can be employed to form printed circuits, for a variety of electrical, electronic and sensing application, such as crack detection in ceramic, plastics, concrete, wood, fabric, leather, rubber or paper and composite materials.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: April 7, 2015
    Assignee: University of Massachusetts Lowell
    Inventors: Ramaswamy Nagarajan, Sharavanan Balasubramaniam, Julie Chen, Joey Mead
  • Publication number: 20140155569
    Abstract: A chemical compound of structural formula (I) useful in preparation of flame retardant materials is disclosed. Homopolymer, and copolymers of a compound of formula (I), as well as methods of preparing said homo- and copolymers are also disclosed. Polymers described herein advantageous possess low heat release capacities and high char yields.
    Type: Application
    Filed: April 30, 2012
    Publication date: June 5, 2014
    Applicant: UNIVERSITY OF MASSACHUSETTS
    Inventors: Jayant Kumar, E. Bryan Coughlin, Todd Emrick, Bon-Cheol Ku, Sethumadhavan Ravichandran, Subhalakshmi Nagarajan, Ramaswamy Nagarajan, Weeradech Kiratitanavit
  • Publication number: 20140045218
    Abstract: A surfactant produced by reacting naturally occurring polysaccharides that are not water soluble with a hydrophilic substituent on a carboxylic portion of the polysaccharide. In a second reaction, the surfactant is further substituted on a hydroxylic portion with a hydrophobic or lipophilic substituent, so as to make the reaction product both water soluble and capable of attracting oily material that is hydrophobic to be removed from a substrate by cleaning in water. Methods of making the surfactant and the follow-on reaction product are described.
    Type: Application
    Filed: March 15, 2013
    Publication date: February 13, 2014
    Applicant: University of Massachusetts
    Inventors: Zarif Farhana Mohd Aris, Ryan M. Bouldin, Ramaswamy Nagarajan, Bridgette Budhlall, Vishal Bavishi
  • Publication number: 20120297888
    Abstract: Wireless strain and displacement sensors wirelessly monitor structural health and integrity, and are made by printing inductor-interdigital capacitor sensing circuits on a variety of substrates, including ceramic substrates, with thermally processable conductive inks. Sensors of the invention can be employed to detect strain and displacement of civil structures, such as bridges and buildings. The sensors include sensing elements that are mounted or printed on stiff, inflexible substrates, which prevent the sensing elements from bending, stretching, or otherwise warping when the sensor is strained. An interlayer between the sensing elements allows the sensing elements to move with respect to each other during application of strain. Thus, strain causes the sensing elements to move but not to deform, causing changes in sensor resonance that can be detected through wireless radio-frequency interrogation.
    Type: Application
    Filed: September 7, 2010
    Publication date: November 29, 2012
    Inventors: Ramaswamy Nagarajan, Jungrae Park, Sharavanan Balasubramaniam, Mario J. Cazeca, Shivshankar Sivasubramanian, Joey Mead, Julie Chen
  • Publication number: 20120273263
    Abstract: Metal flakes, an organic metal precursor, an organic solvent and either no binder, or a volatile or a thermally decomposable binder are combined to form a paste. The paste is deposited in a circuit pattern on a substrate and the circuit pattern is cured. While curing, the organic metal precursor decomposes to leave an electrically conductive path, and the printed circuit is thus formed. A precursor to an electrically conductive circuit material includes an organic metal precursor, metal microparticles, and an organic solvent. The method can be employed to form printed circuits, for a variety of electrical, electronic and sensing application, such as crack detection in ceramic, plastics, concrete, wood, fabric, leather, rubber or paper and composite materials.
    Type: Application
    Filed: December 1, 2009
    Publication date: November 1, 2012
    Inventors: Ramaswamy Nagarajan, Sharavanan Balasubramaniam, Julie Chen, Joey Mead
  • Patent number: 8143308
    Abstract: A method for synthesizing a biocompatible, water-soluble oligo/polyflavanoid, includes polymerizing an optionally substituted flavanoid with a polymerization agent in the presence of a biocompatible polymerization solubilizer, thereby producing the biocompatible, soluble oligo/polyflavanoid. Also included is a biocompatible, soluble, oligo/polyflavanoid or a pharmaceutically acceptable salt, solvate, or complex thereof. Also included are methods of treating a subject for cancer, cardiac damage, viral infection, and obesity.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: March 27, 2012
    Assignees: University of Massachusetts Lowell, The United States of America, as represented by the Secretary of the Army
    Inventors: Ferdinando F. Bruno, Jayant Kumar, Subhalakshmi Nagarajan, Susan J. Braunhut, Ramaswamy Nagarajan, Lynne A. Samuelson, Donna McIntosh, Klaudia Foley
  • Publication number: 20090170928
    Abstract: A method for synthesizing a biocompatible, water-soluble oligo/polyflavanoid, includes polymerizing an optionally substituted flavanoid with a polymerization agent in the presence of a biocompatible polymerization solubilizer, thereby producing the biocompatible, soluble oligo/polyflavanoid. Also included is a biocompatible, soluble, oligo/polyflavanoid or a pharmaceutically acceptable salt, solvate, or complex thereof. Also included are methods of treating a subject for cancer, cardiac damage, viral infection, and obesity.
    Type: Application
    Filed: October 29, 2007
    Publication date: July 2, 2009
    Inventors: Ferdinando F. Bruno, Jayant Kumar, Subhalakshmi Nagarajan, Susan J. Braunhut, Ramaswamy Nagarajan, Lynne A. Samuelson, Donna McIntosh, Klaudia Foley
  • Patent number: 7510739
    Abstract: An assembled hematin is formed by depositing hematin on an electrically charged substrate in one or more layers alternating with one or more layers of polyelectrolyte, preferably a cationic polymer. In a method for polymerizing an aromatic monomer, the assembled hematin is contacted with the monomer and a template, preferably an anionic polymer. In a method for polymerizing aniline, the aniline, sulfonated multi walled carbon nano tubes, PEG hematin and a reaction initiator are dispersed in water.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: March 31, 2009
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ferdinando Bruno, Lynne A. Samuelson, Ramaswamy Nagarajan, Jayant Kumar, Michael Sennett
  • Patent number: 7479329
    Abstract: Hematin, a hydroxyferriprotoporphyrin, is derivatized with one or more non-proteinaceous amphipathic groups. The derivatized hematin can serve as a mimic of horseradish peroxidase in polymerizing aromatic monomers, such as aromatic compounds. These derivatized hematins can also be used as catalysts in polymerizing aromatic monomers, and can exhibit significantly greater catalytic activity than underivatized hematin in acidic solutions. In one embodiment, polymerization is in the presence of a template, along which aromatic monomers align. An assembled hematin includes alternating layers of hematin and a polyelectrolyte, which are deposited on an electrically charged substrate. Assembled hematin can also be used to polymerize aromatic monomers.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: January 20, 2009
    Assignees: University of Massachusetts/Lowell, The United States of America as represented by the Secretary of the Army
    Inventors: Susan Tripathy, legal representative, Lynne A. Samuelson, Ferdinando F. Bruno, Sucharita Roy, Ramaswamy Nagarajan, Jayant Kumar, Bon-Cheol Ku, Soo-Hyoung Lee, Sukant Tripathy