Patents by Inventor Douglas Allen Doughty

Douglas Allen Doughty 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).

  • Device with Mn2+ activated green emitting SrAl12O19 luminescent material
    Patent number: 6774556
    Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+, Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.
    Type: Grant
    Filed: December 26, 2000
    Date of Patent: August 10, 2004
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, Douglas Allen Doughty, William Winder Beers
  • Mn2+ activated green emitting SrAl12O19 luminescent material
    Patent number: 6302959
    Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+, Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laster scintillator.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: October 16, 2001
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, Douglas Allen Doughty, William Winder Beers
  • Mn2+ activated green emitting SrAl12 O19 luminescent material
    Publication number: 20010020696
    Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+, Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.
    Type: Application
    Filed: December 27, 2000
    Publication date: September 13, 2001
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, Douglas Allen Doughty, William Winder Beers
  • Mn2+ activated green emitting SrAI12O19 luminescent material
    Publication number: 20010019241
    Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+ , Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.
    Type: Application
    Filed: December 26, 2000
    Publication date: September 6, 2001
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, Douglas Allen Doughty, William Winder Beers
  • Mn2+ activated green emitting SrAL12O19 luminiscent material
    Patent number: 6210605
    Abstract: A SrAl12O19 green luminescent material is doped with Mn2+ activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions: Ce3+, Pr3+, Gd3+ and Tb3+. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.
    Type: Grant
    Filed: July 26, 1999
    Date of Patent: April 3, 2001
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, Holly Ann Comanzo, Douglas Allen Doughty, William Winder Beers
  • Mercury-free ultraviolet discharge source
    Patent number: 5866984
    Abstract: A mercury-free ultraviolet (UV) discharge source includes an elongated envelope having a diameter in a preferred range from approximately 2 to 3 cm, containing a rare gas fill (xenon or krypton, including mixtures of these with other rare gases) at a pressure in a range from approximately 10 millitorr to approximately 200 millitorr and a power supply for ionizing the rare gas fill and generating a discharge current in a range from approximately 100 to approximately 500 milliamperes (mA). The UV discharge source has an efficiency and output comparable to existing mercury-based low-pressure discharge sources and is intended for use with a suitable phosphor capable of converting the UV radiation to visible light in a fluorescent lamp.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: February 2, 1999
    Assignee: General Electric Company
    Inventors: Douglas Allen Doughty, Timothy John Sommerer
  • Light-emitting diode white light source
    Patent number: 5851063
    Abstract: A system of at least three multi-colored LED's has an optimized color rendering index by proper selection of the wavelengths of each LED, such system being useful for general illumination purposes.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: December 22, 1998
    Assignee: General Electric Company
    Inventors: Douglas Allen Doughty, Anil Raj Duggal, Yung Sheng Liu