Patents by Inventor William Winder Beers

William Winder Beers 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).

  • Light emitting device with phosphor composition
    Patent number: 6252254
    Abstract: The invention relates to a light source comprising a phosphor composition and a light emitting device such as an LED or a laser diode. The phosphor composition absorbs radiation having a first spectrum and emits radiation having a second spectrum and comprises at least one of: YBO3:Ce3+,Tb3+; BaMgAl10O17:Eu2+,Mn2+; (Sr,Ca,Ba)(Al,Ga)2S4:Eu2+; and Y3Al5O12—Ce3+; and at least one of: Y2O2S:Eu3+,Bi3+; YVO4:Eu3+,Bi3+; SrS:Eu2+; SrY2S4:Eu2+; CaLa2S4:Ce3+; and (Ca,Sr)S:Eu2+. The phosphor composition and the light source together can produce white light with pleasing characteristics, such as a color temperature of 3000-6500° K, a color rendering index of about 83-87, and a device luminous efficacy of about 10-20 lumens per watt.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: June 26, 2001
    Assignee: General Electric Company
    Inventors: Thomas Frederick Soules, William Winder Beers, Alok Mani Srivastava, Lionel Monty Levinson, Anil Raj Duggal
  • 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
  • Determination process for determining if quantum splitting phosphors are obtained and novel compositions
    Patent number: 5788883
    Abstract: Quantum splitting phosphors with host lattices activated by praseodymium +3 where covalency of the Pr.sup.+3 -ligand bond is maintained so that the center of gravity of the Pr.sup.+3 4f5d band level is located above the .sup.1 S.sub.0 level and the host lattice has a band gap of greater than about 5 eV.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: August 4, 1998
    Assignee: General Electric Company
    Inventors: Alok Mani Srivastava, William Winder Beers