Patents by Inventor David B. Hedden

David B. Hedden 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).

  • Sustained-release formulation of a cyclooxygenase-2 inhibitor
    Publication number: 20040062803
    Abstract: There is provided an orally deliverable pharmaceutical composition comprising a selective cyclooxygenase-2 inhibitory drug of low water solubility such as celecoxib and a release-extending polymer. The composition is useful in treatment of cyclooxygenase-2 mediated conditions and disorders by once-a-day administration.
    Type: Application
    Filed: February 11, 2003
    Publication date: April 1, 2004
    Inventors: David B. Hedden, Sreekant Nadkarni
  • Sustained-release formulation of a cyclooxygenase-2 inhibitor
    Publication number: 20030219488
    Abstract: There is provided an orally deliverable pharmaceutical composition comprising a selective cyclooxygenase-2 inhibitory drug of low water solubility such as celecoxib and a release-extending polymer. The composition is useful in treatment of cyclooxygenase-2 mediated conditions and disorders by once-a-day administration.
    Type: Application
    Filed: February 11, 2003
    Publication date: November 27, 2003
    Inventors: David B. Hedden, Sreekant Nadkarni
  • Sustained-release formulation of a cyclooxygenase-2 inhibitor
    Publication number: 20030170303
    Abstract: There is provided an orally deliverable pharmaceutical composition comprising a selective cyclooxygenase-2 inhibitory drug of low water solubility such as celecoxib and a release-extending polymer. The composition is useful in treatment of cyclooxygenase-2 mediated conditions and disorders by once-a-day administration.
    Type: Application
    Filed: January 28, 2003
    Publication date: September 11, 2003
    Inventors: David B. Hedden, Sreekant Nadkarni
  • Sustained-release formulation of a cyclooxygenase-2 inhibitor
    Publication number: 20020015735
    Abstract: There is provided an orally deliverable pharmaceutical composition comprising a selective cyclooxygenase-2 inhibitory drug of low water solubility such as celecoxib and a release-extending polymer. The composition is useful in treatment of cyclooxygenase-2 mediated conditions and disorders by once-a-day administration.
    Type: Application
    Filed: December 20, 2000
    Publication date: February 7, 2002
    Inventors: David B. Hedden, Sreekant Nadkarni
  • X-ray intensifying screens with mixed morophology phosphors
    Patent number: 5494761
    Abstract: An X-ray evaluation apparatus of a film in cooperation with an intensifying screen with improved resolution at a constant coating weight and speed comprises a phosphor-binder layer coated on a support, wherein the phosphor comprises a rare earth tantalate phosphor in which 5-80% has a tabular morphology with an average aspect ratio of about 2:1 and the remainder of the phosphor has a polyhedral morphology.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: February 27, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: David B. Hedden, William Zegarski
  • Flux for phosphor particle size control
    Patent number: 5395554
    Abstract: An improved flux for use in preparing X-ray phosphors comprises an alkali metal sulfate, an alkali metal metaborate and, a strontium halide. By varying the concentration of the metaborate and strontium halide in the flux composition, the size and dry bulk density of the phosphor particles and the speed of the phosphor, respectively, can be controlled. Also disclosed is a process of making phosphors using the above flux, and X-ray intensifying screens containing such phosphors.
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: March 7, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: David B. Hedden, William J. Zegarski
  • Process of making tantalate X-ray phosphors
    Patent number: 5310505
    Abstract: An improved flux for use in preparing X-ray phosphors comprises an alkali metal sulfate, an alkali metal metaborate and, optionally a strontium halide. By varying the concentration of the metaborate and strontium halide in the flux composition, the size and dry bulk density of the phosphor particles and the speed of the phosphor, respectively, can be controlled. Also disclosed is a process of making phosphors using the above flux, and X-ray intensifying screens containing such phosphors.
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: May 10, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: David B. Hedden, William J. Zegarski
  • X-ray intensifying screens with mixed morphology phosphors
    Patent number: 5250365
    Abstract: An X-ray intensifying screen with improved resolution at a constant coating weight and speed comprises a phosphor-binder layer coated on a support, wherein the phosphor comprises a rare earth tantalate phosphor in which 5-80% has a tabular morphology with an average aspect ratio of about 2:1 and the remainder of the phosphor has a polyhedral morphology.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: October 5, 1993
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: David B. Hedden, William Zegarski
  • Process of making X-ray phosphors having improved efficiency
    Patent number: 5154360
    Abstract: A process for preparing an X-ray phosphor comprising the steps of:(a) mixing a predetermined ratio of phosphor precursors;(b) grinding the mixture in a fluid grinding mill to obtain particles of a predetermined size;(c) firing the mixture; and(d) recovering the phosphor.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: October 13, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: David B. Hedden, Constantine D. Markellos