Patents by Inventor Leonard J. Chyall

Leonard J. Chyall 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).

  • Crystalline forms of oxymorphone hydrochloride
    Patent number: 8563571
    Abstract: The present invention is directed to crystalline forms of oxymorphone hydrochloride.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: October 22, 2013
    Assignee: Noramco, Inc.
    Inventors: Karen S. Gushurst, Leonard J. Chyall, Lien H. Koztecki, Brenton Skylar Wolfe
  • CRYSTALLINE FORMS OF OXYMORPHONE HYDROCHLORIDE
    Publication number: 20120022093
    Abstract: The present invention is directed to crystalline forms of oxymorphone hydrochloride.
    Type: Application
    Filed: July 21, 2011
    Publication date: January 26, 2012
    Inventors: Karen S. Gushurst, Leonard J. Chyall, Lien H. Koztecki, Brenton Skylar Wolfe
  • Intumescent polymer compositions
    Patent number: 6905693
    Abstract: An intumescent polymer composition includes a matrix polymer, an acid catalyst source, a nitrogen source and an ionic phyllosilicate synergist having substantial cationic exchange capacity.
    Type: Grant
    Filed: June 3, 2003
    Date of Patent: June 14, 2005
    Assignee: PABU Services, Inc.
    Inventors: Leonard J. Chyall, Harry A. Hodgen, Frederick J. Vyverberg, Robert W. Chapman
  • Method and apparatus for x-ray diffraction analysis
    Publication number: 20040234030
    Abstract: The present invention relates to a method and apparatus for X-ray diffraction analysis. An improved sample holder is provided that includes a curved surface or a plurality of surfaces at different planes. An improved sample holder also has removable individual sample holders.
    Type: Application
    Filed: December 8, 2003
    Publication date: November 25, 2004
    Inventors: Jesse R. Miller, Barbara C. Stahly, Leonard J. Chyall, Igor Ivanisevic, Simon Bates
  • Intumescent polymer compositions
    Publication number: 20030209699
    Abstract: An intumescent polymer composition includes a matrix polymer, an acid catalyst source, a nitrogen source and an ionic phyllosilicate synergist having substantial cationic exchange capacity.
    Type: Application
    Filed: June 3, 2003
    Publication date: November 13, 2003
    Inventors: Leonard J. Chyall, Harry A. Hodgen, Frederick J. Vyverberg, Robert W. Chapman
  • Intumescent polymer compositions
    Patent number: 6632442
    Abstract: An intumescent polymer composition includes a matrix polymer, an acid catalyst source, a nitrogen source and an ionic phyllosilicate synergist having substantial cationic exchange capacity.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: October 14, 2003
    Assignee: PABU Services, Inc.
    Inventors: Leonard J. Chyall, Harry A. Hodgen, Frederick J. Vyverberg, Robert W. Chapman, Phillip K. Chou
  • Bromine-containing 1,2-bis(phenyl)difluoromethanes and method of imparting flame retardancy to flammable materials
    Patent number: 6348633
    Abstract: Bromine containing 1,2-bis(phenyl)difluoromethane derivatives, a method for their preparation and their use in flame retardant compositions.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: February 19, 2002
    Assignee: PCBU Services, Inc.
    Inventors: Mark L. Robin, Charles J. Mazac, Leonard J. Chyall, Paul Kleindl