Patents by Inventor Sivaraman Raghu

Sivaraman Raghu 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).

  • Patent number: 9932495
    Abstract: Coating compositions that provide hydrophilic and self-cleaning properties upon exposure to an electromagnetic spectrum are disclosed. Coatings can include lignin-coumarate derivatives and/or lignin-azobenzene derivatives. When exposed to the electromagnetic spectrum, these compounds isomerize to cis-configuration which are hydrophilic in nature as compared to when these compounds are in their hydrophobic trans-state.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: April 3, 2018
    Assignee: Empire Technology Development LLC
    Inventor: Sivaraman Raghu
  • Publication number: 20180002085
    Abstract: Provided herein are materials comprising a crosslinked polymer and a hydrophobic starch, wherein the crosslinked polymer comprises a first polymer and a second polymer and the first polymer comprises a lignin polymer or a salt thereof, and methods of use and preparation thereof.
    Type: Application
    Filed: June 19, 2017
    Publication date: January 4, 2018
    Applicant: EMPIRE TECHNOLOGY DEVELOPMENT LLC
    Inventor: Sivaraman Raghu
  • Patent number: 9556342
    Abstract: Methods and compositions with anti-fouling properties that are derived from lignin are disclosed. The compositions include lignin with one or more zwitterionic functional groups. The lignin with one or more zwitterionic functional groups may be incorporated in paints and coatings to prepare biocidal coatings.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: January 31, 2017
    Assignee: EMPIRE TECHNOLOGY DEVELOPMENT LLC
    Inventor: Sivaraman Raghu
  • Publication number: 20160040029
    Abstract: Coating compositions that provide hydrophilic and self-cleaning properties upon exposure to UV or visible light are disclosed. Coatings can include derivatives of coumarates and/or azobenzene compounds. When exposed to UV or visible light, these compounds isomerize to cis-configuration which are hydrophilic in nature as compared to when in their hydrophobic trans-state.
    Type: Application
    Filed: March 18, 2014
    Publication date: February 11, 2016
    Inventor: Sivaraman RAGHU
  • Publication number: 20150307746
    Abstract: Coating compositions that provide hydrophilic and self-cleaning properties upon exposure to an electromagnetic spectrum are disclosed. Coatings can include lignin-coumarate derivatives and/or lignin-azobenzene derivatives. When exposed to the electromagnetic spectrum, these compounds isomerize to cis-configuration which are hydrophilic in nature as compared to when these compounds are in their hydrophobic trans-state.
    Type: Application
    Filed: April 23, 2015
    Publication date: October 29, 2015
    Inventor: Sivaraman RAGHU
  • Publication number: 20150135989
    Abstract: Methods and compositions with anti-fouling properties that are derived from lignin are disclosed. The compositions include lignin with one or more zwitterionic functional groups. The lignin with one or more zwitterionic functional groups may be incorporated in paints and coatings to prepare biocidal coatings.
    Type: Application
    Filed: November 21, 2014
    Publication date: May 21, 2015
    Inventor: Sivaraman RAGHU
  • Publication number: 20150072581
    Abstract: Methods of forming a nanocellulose composite are provided. The methods can include blending a copolymer with a nanocellulose to form the nanocellulose composite. The copolymer can be a reaction product of a first monomer, a second monomer, and a third monomer. The first monomer is a hydrophilic monomer, the second monomer is a cellulose-reactive monomer and the third monomer is an amphiphobic monomer.
    Type: Application
    Filed: September 9, 2014
    Publication date: March 12, 2015
    Applicant: Empire Technology Development LLC
    Inventor: Sivaraman Raghu
  • Patent number: 4620009
    Abstract: A process for the manufacture of 1-(2-alkoxyethyl)-4-phenyl-4-imidazolin-2-ones, 1-(2-alkoxyethyl)-4-phenyl-2-imidazolidones, 1-(2-alkoxyethyl)-4-phenyl-imidazolidine-2-thiones, certain of the corresponding 1-(2-hydroxyethyl) derivatives and their 3-acylated derivatives, and certain related compounds which are all useful as intermediates in a new process for the manufacture of tetramisole, dl-2,3,5,6-tetrahydro-6-phenylimidazo-[2,1-b]thiazole, and its derivatives. The compound tetramisole is useful as an anthelmintic.
    Type: Grant
    Filed: October 1, 1981
    Date of Patent: October 28, 1986
    Assignee: Cyanamid Agricultural de Puerto Rico, Inc.
    Inventors: Sivaraman Raghu, Arthur K. Hoffmann, Balwant Singh
  • Patent number: 4499283
    Abstract: This disclosure describes a novel process for the preparation of 2-(n-propyl)-4-methyl-5-(lower alkanoyl)imidazoles which are useful as intermediates for the preparation of anti-asthmatic agents.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: February 12, 1985
    Assignee: American Cyanamid Company
    Inventors: Sivaraman Raghu, Steven L. Peake
  • Patent number: 4459413
    Abstract: This disclosure describes a novel process for the preparation of 1-(lower alkyl)substituted derivatives of 6-n-propyl-8-alkylimidazo[1,5-d]-as-triazin-4(3H)-ones which are useful as anti-asthmatic agents.
    Type: Grant
    Filed: February 11, 1983
    Date of Patent: July 10, 1984
    Assignee: American Cyanamid Company
    Inventors: Sivaraman Raghu, James Salvatore, Steven L. Peake
  • Patent number: 4439611
    Abstract: This disclosure describes continuous epimerization-crystallization process for the isolation of [S-(R*, S*)]-1-(3-acetylthio-3-benzoyl-2-methylpropionyl)-L-proline from a diasteromeric mixture thereof with [S-(R*, R*)]-1-(3-acetylthio-3-benzoyl-2-methylpropionyl)-L-proline.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: March 27, 1984
    Assignee: American Cyanamid Company
    Inventors: Sivaraman Raghu, Robert J. Proverb, Steven L. Peake
  • Patent number: 4408072
    Abstract: Processes for reacting arylvinyl oxides and alkoxyethylamines to provide novel N-substituted alkoxyethylamines; processes for reacting the novel N-substituted amines with nitriles to provide novel amidoamines; processes for preparing novel diamines from the amidoamines, together with the novel nitrogen-containing products so produced, such products being useful for the preparation of various imidazothiazoles including tetramisole.
    Type: Grant
    Filed: May 8, 1981
    Date of Patent: October 4, 1983
    Assignee: American Cyanamid Company
    Inventor: Sivaraman Raghu
  • Patent number: 4405529
    Abstract: A method for the preparation of certain difluoromethoxyaromatic compounds useful as intermediates in the preparation of pyrethroid pesticides. The method comprises alkylating a p-substituted phenol with excess chlorodifluoromethane at atmospheric or superatmospheric pressures in the presence of a base, water, and an inert water miscible organic solvent or solvent mixtures.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: September 20, 1983
    Assignee: American Cyanamid Company
    Inventors: Jack K. Siddens, Sivaraman Raghu
  • Patent number: 4395547
    Abstract: This disclosure describes a novel process for the preparation of 1-(lower alkyl)substituted derivatives of 6-n-propyl-8-alkylimidazo[1,5-d]-as-triazin-4(3H)-ones which are useful as anti-asthmatic agents.
    Type: Grant
    Filed: February 10, 1982
    Date of Patent: July 26, 1983
    Assignee: American Cyanamid Co.
    Inventors: Sivaraman Raghu, James S. Farina, Steven L. Peake
  • Patent number: 4370482
    Abstract: A process for the manufacture of 1-(2-alkoxyethyl)-4-phenyl-4-imidazolin-2-ones, 1-(2-alkoxyethyl)-4-phenyl-2-imidazolidones, 1-(2-alkoxyethyl)-4-phenyl-imidazolidine-2-thiones, certain of the corresponding 1-(2-hydroxyethyl) derivatives, and their 3-acylated derivatives, and certain related compounds which are all useful as intermediates in a new process for the manufacture of the anthelmintic levamisole, (-)-2,3,5,6-tetrahydro-6-phenylimidazo-[2,1-b]thiazols, and its derivatives through conventional resolution procedures. The new process also permits the direct manufacture of optically active 1-(2-alkoxyethyl)-4-phenyl-2-imidazolidone and their 3-acylated derivatives, optically active 1-(2-alkoxyethyl)-4-phenylimidazolidine-2-thiones, and levamisole, the levorotatory isomer of tetramisole, using catalytic amounts of a chiral reducing agent, with the elimination of conventional resolution procedures.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: January 25, 1983
    Assignee: American Cyanamid Co.
    Inventors: Sivaraman Raghu, Arthur K. Hoffmann, Balwant Singh
  • Patent number: 4339603
    Abstract: There is provided a process for racemizing an undesirable, optically active compound for conversion to levamisole, namely, l-N-(2-amino-2-phenethyl)-2-methoxyethylamine, by converting the latter to optically active l-(2-methoxyethyl)-4-phenyl-2-imidazolidone, which is next converted to the corresponding optically inactive imidazolidone derivative, which derivative is hydrolyzed to the optically inactive racemate, dl-N-(2-amino-2-phenethyl)-2-methoxyethylamine. The latter can be resolved to obtain the d and l components of the racemate, the d component being utilized directly in levamisole synthesis and the l component being again subjected to the above procedure.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: July 13, 1982
    Assignee: American Cyanamid Company
    Inventors: Sivaraman Raghu, Arnold Zweig
  • Patent number: 4316038
    Abstract: Processes for reacting aryl vinyl compounds, nitriles, and halogens to provide imidoyl halides; processes for preparing amidine hydrohalides from the imidoyl compounds; processes for producing novel imidazolines from the amidine hydrohalides; processes for preparing novel amidoamines from the imidazolines; processes for preparing novel diamines from the amidoamines, together with novel nitrogen-containing products so produced, such products being useful for the production of various imidazothiazoles including tetramisole.
    Type: Grant
    Filed: May 21, 1980
    Date of Patent: February 16, 1982
    Assignee: American Cyanamid Company
    Inventor: Sivaraman Raghu
  • Patent number: 4314066
    Abstract: A process for the manufacture of 1-(2-alkoxyethyl)-4-phenyl-4-imidazolin-2-ones, 1-(2-alkoxyethyl)-4-phenyl-2-imidazolidones, 1-(2-alkoxyethyl)-4-phenyl-imidazolidine-2-thiones, certain of the corresponding 1-(2-hydroxyethyl) derivatives, and their 3-acylated derivatives, and certain related compounds which are all useful as intermediates in a new process for the manufacture of the anthelmintic levamisole, (-)-2,3,5,6-tetrahydro-6-phenylimidazo-[2,1-b]thiazole, and its derivatives through conventional resolution procedures. The new process also permits the direct manufacture of optically active 1-(2-alkoxyethyl)-4-phenyl-2-imidazolidone and their 3-acylated derivatives, optically active 1-(2-alkoxyethyl)-4-phenylimidazolidine-2-thiones, and levamisole, the levorotatory isomer of tetramisole, using catalytic amounts of a chiral reducing agent, with the elimination of conventional resolution procedures.
    Type: Grant
    Filed: February 15, 1978
    Date of Patent: February 2, 1982
    Assignee: American Cyanamid Co.
    Inventors: Sivaraman Raghu, Arthur K. Hoffmann, Balwant Singh
  • Patent number: 4314079
    Abstract: Processes for reacting arylvinyl oxides and alkoxyethylamines to provide novel N-substituted alkoxyethylamines; processes for reacting the novel N-substituted amines with nitriles to provide novel amidoamines; processes for preparing novel diamines from the amidoamines, together with the novel nitrogen-containing products so produced, such products being useful for the preparation of various imidazothiazoles including tetramisole.
    Type: Grant
    Filed: May 21, 1980
    Date of Patent: February 2, 1982
    Assignee: American Cyanamid Company
    Inventor: Sivaraman Raghu
  • Patent number: 4310672
    Abstract: A process for the manufacture of 1-(2-alkoxyethyl)-4-phenyl-4-imidazolin-2-ones, 1-(2-alkoxyethyl)-4-phenyl-2-imidazolidones, 1-(2-alkoxyethyl)-4-phenyl-imidazolidine-2-thiones, certain of the corresponding 1-(2-hydroxyethyl) derivatives and their 3-acylated derivatives, and certain related compounds which are all useful as intermediates in a new process for the manufacture of tetramisole, di-2,3,5,6-tetrahydro-6-phenylimidazo-[2,1-b]thiazole, and its derivatives. The compound tetramisole is useful as an anthelmintic.
    Type: Grant
    Filed: March 17, 1980
    Date of Patent: January 12, 1982
    Assignee: American Cyanamid Co.
    Inventors: Sivaraman Raghu, Arthur K. Hoffmann, Balwant Singh