Patents by Inventor Charles Duvall

Charles Duvall 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: 7112622
    Abstract: The present invention encompasses a novel organic based composition which includes at least one organic based heat stabilizer component, and at least one stabilizer modifying component selected from the group of liquid calcium soap and 1,3,5-tris (2-hydroxyethyl) cyanuric acid. The invention also encompasses heat stabilized polymer compositions made with the novel organic based composition disclosed herein.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: September 26, 2006
    Assignee: Rohm and Haas Company
    Inventors: Paul Brian Adams, Tod Charles Duvall, Gene Kelly Norris
  • Publication number: 20030227006
    Abstract: The present invention encompasses a novel organic based composition which includes at least one organic based heat stabilizer component, and at least one stabilizer modifying component selected from the group of liquid calcium soap and 1,3,5-tris (2-hydroxyethyl) cyanuric acid. The invention also encompasses heat stabilized polymer compositions made with the novel organic based composition disclosed herein.
    Type: Application
    Filed: March 3, 2003
    Publication date: December 11, 2003
    Inventors: Paul Brian Adams, Tod Charles Duvall, Gene Kelly Norris
  • Patent number: 5579421
    Abstract: An optical integrated circuit provides a 1.times.2 power splitting function for a communication system and additionally provides at least one type of upgrade capability for the system. The upgrade capability may be remote optical time domain reflectometry (OTDR) testing at an out-of-band wavelength. The OTDR testing is performed around a power splitter whereby a fault may be precisely located on an output line past the power splitter. Other upgrade capabilities that an optical integrated circuit may provide are the ability to add optical network units (ONUs) to the communication at a later time or to increase the bandwidth without requiring any new cables between a central office and the optical circuit. The optical integrated circuits can provide these upgraded capabilities with a higher reliability than circuits which are manufactured with discrete components and at a lower cost.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: November 26, 1996
    Assignee: Lucent Technologies Inc.
    Inventors: Charles Duvall, Ian A. White, Henry H. Yaffe