Patents by Inventor Karunakaran Narasimhan

Karunakaran Narasimhan 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: 20060057691
    Abstract: The present invention relates to a process for extracting polyhydroxyalkanoate from a biomass, comprising contacting the biomass with an organic solvent for a time, at a first temperature, and under a pressure that are sufficient to extract polyhydroxyalkanoate from the biomass to provide a composition comprising the organic solvent and polyhydroxyalkanoate; cooling the composition at a second temperature, which is at least about 10° C. lower than the first temperature; and mixing the composition at a second temperature with a power to volume ratio of from about 0.001 KW/m3 to about 100 KW/m3.
    Type: Application
    Filed: September 13, 2005
    Publication date: March 16, 2006
    Inventors: Karunakaran Narasimhan, Roland Severson, Susan Buescher, Angella Cearley, Michael Gibson, Stanley Welling
  • Publication number: 20060057692
    Abstract: The invention relates to processes for extracting polyhydroxyalkanoate from a biomass, comprising admixing the biomass with an organic solvent for from 1 second to 15 minutes at a first temperature of from 5° C. below the melting point of the polyhydroxyalkanoate to 10° C. above the melting point of the polyhydroxyalkanoate and at a pressure of from 1 bar to 10 bar to provide a composition comprising the organic solvent and polyhydroxyalkanoate.
    Type: Application
    Filed: September 13, 2005
    Publication date: March 16, 2006
    Inventors: Karunakaran Narasimhan, Isao Noda, Michael Satkowski, Angella Cearley, Michael Gibson, Stanley Welling
  • Publication number: 20050287653
    Abstract: Processes for the extraction of PHAs from biomass, said processes comprising: combining the biomass containing the PHAs with a single main solvent to form a biomass liquor; heating the biomass liquor to at least partially solubilize the PHAs from the biomass to form a PHA liquor; separating the biomass from the PHA liquor to form a PHA-enriched liquor; evaporating from 0% to about 50% of the single main solvent from the PHA-enriched liquor to form a solvent vapor and a concentrated PHA-enriched liquor; and cooling the concentrated PHA-enriched liquor to form precipitated PHAs and an impure solvent liquor. Optionally, further recovering the precipitated PHAs from the impure solvent liquor by filtration under pressure. A PHA-enriched liquor and a concentrated PHA-enriched liquor.
    Type: Application
    Filed: June 29, 2005
    Publication date: December 29, 2005
    Inventors: Karunakaran Narasimhan, Kenneth Yee, Angella Cearley, Donald Levengood, Guo-Qiang Chen
  • Publication number: 20050287654
    Abstract: Improved processes for extracting polyhydroxyalkanoate from a biomass containing the polyhydroxyalkanoate including the steps of: combining the biomass containing the polyhydroxyalkanoate with a solvent selected from lower chain ketones, and mixtures thereof to form a biomass liquor wherein the biomass liquor comprises less than about 25% water; mixing the biomass liquor for from about 10 to about 300 minutes at a temperature in the range of from about 70° C. to about 120° C.; separating the polyhydroxyalkanoate from the biomass liquor to form a PHA-enriched liquor, wherein the separating occurs at a temperature of at least about 40° C.; mixing the PHA-enriched liquor with water to form precipitated polyhydroxyalkanoate and an impure solvent liquor, wherein the water is mixed with the PHA enriched liquor in the ratio of from at least about 0.4-1 parts of water to one part solvent; and recovering the precipitated polyhydroxyalkanoate from the impure solvent liquor.
    Type: Application
    Filed: June 29, 2005
    Publication date: December 29, 2005
    Inventors: Karunakaran Narasimhan, Angella Cearley, Michael Gibson, Stanley Welling
  • Publication number: 20050239998
    Abstract: The present invention provides a method for obtaining a biodegradable polyhydroxyalkanoate by a solvent extraction method without causing a significant molecular weight decrease. The present invention relates to a method for producing a polyhydroxyalkanoate which comprises extracting a polyhydroxyalkanoate from a polyhydroxyalkanoate-containing biomass having the water content of 5% by weight or less using an extraction solvent, crystallizing, and recovering the resultant.
    Type: Application
    Filed: March 3, 2005
    Publication date: October 27, 2005
    Inventors: Koichi Kinoshita, Yoshifumi Yanagida, Fumio Osakada, Yasuyoshi Ueda, Karunakaran Narasimhan, Angella Cearley, Kenneth Yee, Isao Noda
  • Publication number: 20050228168
    Abstract: The present invention provides a method for conveniently obtaining a biodegradable polyhydroxyalkanoate by a solvent extraction method. A method for producing a polyhydroxyalkanoate crystal comprises precipitating a polyhydroxyalkanoate crystal using a monohydric alcohol having 4 to 10 carbon atoms as a extraction solvent, keeping a polyhydroxyalkanoate solution containing 0.1 to 10% by weight of water relative to the total amount of the solution warm at 70° C. or higher, and cooling the solution to below 70° C.
    Type: Application
    Filed: November 19, 2004
    Publication date: October 13, 2005
    Inventors: Koichi Kinoshita, Fumio Osakada, Yasuyoshi Ueda, Karunakaran Narasimhan, Angella Cearley, Kenneth Yee, Isao Noda
  • Publication number: 20050222373
    Abstract: The present invention provides a method for easily obtaining a biodegradable polyhydroxyalkanoate by a solvent extraction method. A method for producing a polyhydroxyalkanoate crystal which comprises mixing a solution of a polyhydroxyalkanoate in a good solvent with a poor solvent at 50 to 130° C. to precipitate a polyhydroxyalkanoate.
    Type: Application
    Filed: November 19, 2004
    Publication date: October 6, 2005
    Inventors: Koichi Kinoshita, Fumio Osakada, Yasuyoshi Ueda, Karunakaran Narasimhan, Angella Cearley, Kenneth Yee, Isao Noda