Patents by Inventor Suresh Das

Suresh Das 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).

  • 2H-chromenes annelated at C-Cand methods of making and using thereof
    Patent number: 8217188
    Abstract: Described herein are C5-C6 annelated naphthopyrans that possess at least one electron-withdrawing group. The compounds possess desirable properties such as increased fading kinetics. Also described herein are new methods for synthesizing 2H-chromenes annelated at C5-C6. The methods involve less stringent reaction conditions as well as provide increased reaction yields. The methods permit the synthesis of a wide variety of substituted naphthopyrans that can be temperature sensitive, which was not possible with previous synthetic routes.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: July 10, 2012
    Assignee: Corning Incorporated
    Inventors: Suresh Das, Bruno Dufour, Mangalam S Nair, Kokkuvayil V Radhakrishnan
  • 2H-CHROMENES ANNELATED AT C5-C6 AND METHODS OF MAKING AND USING THEREOF
    Publication number: 20100056810
    Abstract: Described herein are C5-C6 annelated naphthopyrans that possess at least one electron-withdrawing group. The compounds possess desirable properties such as increased fading kinetics. Also described herein are new methods for synthesizing 2H-chromenes annelated at C5-C6. The methods involve less stringent reaction conditions as well as provide increased reaction yields. The methods permit the synthesis of a wide variety of substituted naphthopyrans that can be temperature sensitive, which was not possible with previous synthetic routes.
    Type: Application
    Filed: August 4, 2009
    Publication date: March 4, 2010
    Inventors: Suresh Das, Bruno Dufour, Mangalam S Nair, Kokkuvayil V. Radhakrishnan
  • Non-visualized permanent information recording substrate for use as a security label for authentication
    Patent number: 6951692
    Abstract: The present invention relates to an information carrying substrate capable of being applied to a surface for authenticating said surface, and more particularly, the present invention relates to a an information carrying substrate capable of being affixed to a document or a product for authenticating the document or the product and also relates to method for writing an authenticating information on said substrate and further provides a method for authenticating a surface using said substrate.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: October 4, 2005
    Assignee: Council of Scientific and Industrial Research
    Inventors: Suresh Das, Riju Davis
  • Heavier halogen atom substituted squaraine based dyes, process for the preparation thereof and use thereof as sensitizers for photodynamic, therapeutical and industrial applications
    Patent number: 6770787
    Abstract: The present invention relates to heavier halogen atom substituted squaraine based dyes of the formula 1 below where X is a heavier halogen atom and pharmaceutically acceptable derivatives thereof, which can be used in photodynamic therapeutical and industrial applications, and to a process for the preparation thereof.
    Type: Grant
    Filed: January 2, 2001
    Date of Patent: August 3, 2004
    Inventors: Ramaiah Danaboyina, Arun Kalliat Thazhathveetil, Suresh Das, Bernd Epe
  • Heavier halogen atom substituted squaraine based dyes, process for the preparation thereof and use thereof as sensitizers for photodynamic, therapeutical and industrial applications
    Publication number: 20020123532
    Abstract: The present invention relates to heavier halogen atom substituted squaraine based dyes of the formula 1 below 1
    Type: Application
    Filed: January 2, 2001
    Publication date: September 5, 2002
    Inventors: Ramaiah Danaboyina, Arun Kalliat Thazhathveetil, Suresh Das, Bernd Epe
  • Squaraine based dyes and process for preparation thereof
    Patent number: 6417402
    Abstract: The present invention relates to squaraine dye containing terminal aminoanthracene or acridine groups and to a process for preparation thereof.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: July 9, 2002
    Assignee: Council of Scientific and Industrial Research
    Inventors: Suresh Das, George Thomas Kakkudiyil, Biju Vasudevan Pillai, Santosh Unni, Suresh Velate