Patents by Inventor Jamuna Chakravarti

Jamuna Chakravarti 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: 9139695
    Abstract: Compositions and methods for producing compositions comprising a monoamine-endcapped polyimide component. Based on a gas chromatography mass spectroscopy analysis of a surface rinse of the composition performed at room temperature, the composition can have at least one surface with less than or equal to 5 ppb releasable phosphorous residuals, and less than or equal to 5 ppb releasable volatile organic compound residuals. The composition can also comprise less than or equal to 10 ppb combined releasable residuals. Because of the very low levels of residual contamination, the compositions can be used to produce a variety of articles including a disk drive.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: September 22, 2015
    Assignee: SABIC Global Technologies B.V.
    Inventors: Daniel Francis Lowery, Jamuna Chakravarti, Aaron Royer
  • Publication number: 20140016450
    Abstract: Compositions and methods for producing compositions comprising a monoamine-endcapped polyimide component. Based on a gas chromatography mass spectroscopy analysis of a surface rinse of the composition performed at room temperature, the composition can have at least one surface with less than or equal to 5 ppb releasable phosphorous residuals, and less than or equal to 5 ppb releasable volatile organic compound residuals. The composition can also comprise less than or equal to 10 ppb combined releasable residuals. Because of the very low levels of residual contamination, the compositions can be used to produce a variety of articles including a disk drive.
    Type: Application
    Filed: September 16, 2013
    Publication date: January 16, 2014
    Applicant: SABIC INNOVATIVE PLASTICS IP B.V.
    Inventors: Daniel Francis Lowery, Jamuna Chakravarti, Aaron Royer
  • Patent number: 8535792
    Abstract: Compositions and methods for producing compositions comprising a monoamine-endcapped polyimide component. Based on a gas chromatography mass spectroscopy analysis of a surface rinse of the composition performed at room temperature, the composition can have at least one surface with less than or equal to 5 ppb releasable phosphorous residuals, and less than or equal to 5 ppb releasable volatile organic compound residuals. The composition can also comprise less than or equal to 10 ppb combined releasable residuals. Because of the very low levels of residual contamination, the compositions can be used to produce a variety of articles, including a disk drive.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: September 17, 2013
    Assignee: Sabic Innovative Plastics IP B.V.
    Inventors: Daniel Francis Lowery, Jamuna Chakravarti, Aaron Royer
  • Publication number: 20130003227
    Abstract: Compositions and methods for producing compositions comprising a monoamine-endcapped polyimide component. Based on a gas chromatography mass spectroscopy analysis of a surface rinse of the composition performed at room temperature, the composition can have at least one surface with less than or equal to 5 ppb releasable phosphorous residuals, and less than or equal to 5 ppb releasable volatile organic compound residuals. The composition can also comprise less than or equal to 10 ppb combined releasable residuals. Because of the very low levels of residual contamination, the compositions can be used to produce a variety of articles, including a disk drive.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 3, 2013
    Inventors: Daniel Francis Lowery, Jamuna Chakravarti, Aaron Royer
  • Publication number: 20110183120
    Abstract: A coated thermoplastic film can be subjected to printing to obtain a decorative film, preformed (for example, thermoformed), and then inserted into a mold that has the configuration of the preformed decorative film A base polymeric structure comprising a polymer such as a polycarbonate or blend thereof can be injection molded to the exposed surface of the preformed decorative film The molded structure has various applications such as cell phones or other electronic devices, automotive vehicles, appliances, display panels, lenses, etc. A process for making the molded article is also described. The coating for the coated thermoplastic film can be made from a UV-curable composition and can provide superior embossing and thermoformability, hardness, and adhesion, while providing enhanced chemical, scratch and abrasion resistance.
    Type: Application
    Filed: July 2, 2009
    Publication date: July 28, 2011
    Applicant: SABIC INNOVATIVE PLASTICS IP B.V.
    Inventors: Andrei Sharygin, David Clinnin, Kwan Hongladarom, Jamuna Chakravarti, Keshav Gautum, Michael Matthew Laurin
  • Publication number: 20100003523
    Abstract: A coated thermoplastic film can be subjected to printing to obtain a decorative film, preformed (for example, thermoformed), and then inserted into a mold that has the configuration of the preformed decorative film. A base polymeric structure comprising a polymer such as a polycarbonate or blend thereof can be injection molded to the exposed surface of the preformed decorative film. The molded structure has various applications such as cell phones or other electronic devices, automotive vehicles, appliances, display panels, lenses, etc. A process for making the molded article is also described. The coating for the coated thermoplastic film can be made from a UV-curable composition and can provide superior embossing and thermoformability, hardness, and adhesion, while providing enhanced chemical, scratch and abrasion resistance.
    Type: Application
    Filed: July 2, 2008
    Publication date: January 7, 2010
    Applicant: SABIC INNOVATIVE PLASTICS IP B.V.
    Inventors: Andrei Sharygin, David Clinnin, Kwan Hongladarom, Jamuna Chakravarti, Keshav Gautam, Michael Matthew Laurin
  • Publication number: 20070114693
    Abstract: Disclosed herein is a method comprising inspecting a mold for a defect; determining a type of defect present on the mold; sorting the mold by type of defect present; treating the mold with a cleaning process that is suitable to remove the defect; and pressing the mold against a polymeric film to produce a series of defect free light management films; wherein the yield of light management films manufactured from the mold is higher than the yield of light management films that are produced from a comparative mold that has not been treated with the cleaning process.
    Type: Application
    Filed: November 21, 2005
    Publication date: May 24, 2007
    Inventors: Paul Buckley, Kevin Capaldo, Jamuna Chakravarti, Mark Cheverton, David Clinnin, Michael Davis, Robert Little, Vijay Paruchuru, Micah Sze, Sameer Talsania, Vicki Watkins, Masako Yamada, Jana York, Kenneth Zarnoch