Patents by Inventor Wolfram Hempel

Wolfram Hempel 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).

  • Illuminant and light source containing the same, and method for producing said illuminant
    Patent number: 9109161
    Abstract: An illumination from the class of oxynitridosilicates, doped with bivalent europium and comprising a cation M2+, said illuminant corresponding to the basic formula M(l-c)Si202N2:Dc wherein the following holds good: M=Sr(1-x)Bax mit 0.3<x<0.7.
    Type: Grant
    Filed: February 19, 2007
    Date of Patent: August 18, 2015
    Assignee: OSRAM Geseilschaft mit beschrankter Haftung
    Inventors: Daniel Becker, Tim Fiedler, Wolfram Hempel, Frank Jermann
  • Thermally stable oxynitride phosphor and light source comprising such a phosphor
    Patent number: 8808577
    Abstract: A thermally stable phosphor made of the M-Si—O—N system, having a cation M and an activator D, M being represented by Ba or Sr alone or as a mixture and optionally also being combined with at least one other element from the group Ca, Mg, Zn, Cu. The phosphor is activated with Eu or Ce or Tb alone or as a mixture, optionally in codoping with Mn or Yb. The activator D partially replaces the cation M. The phosphor is produced from the charge stoichiometry MO—SiO2—SiN4/3 with an increased oxygen content relative to the known phosphor MSi2O2N2:D, where MO is an oxidic compound.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: August 19, 2014
    Assignee: OSRAM Gesellschaft mit beschrankter Haftung
    Inventors: Daniel Becker, Wolfram Hempel, Frank Jermann, Bianca Pohl
  • Temperature-Stable Oxynitride Phosphor and Light Source Comprising a Corresponding Phosphor Material
    Publication number: 20110186778
    Abstract: A thermally stable phosphor made of the M-Si—O—N system, having a cation M and an activator D, M being represented by Ba or Sr alone or as a mixture and optionally also being combined with at least one other element from the group Ca, Mg, Zn, Cu. The phosphor is activated with Eu or Ce or Tb alone or as a mixture, optionally in codoping with Mn or Yb. The activator D partially replaces the cation M. The phosphor is produced from the charge stoichiometry MO—SiO2—SiN4/3 with an increased oxygen content relative to the known phosphor MSi2O2N2:D, where MO is an oxidic compound.
    Type: Application
    Filed: July 24, 2008
    Publication date: August 4, 2011
    Inventors: Daniel Becker, Wolfram Hempel, Frank Jermann, Bianca Pohl
  • Red-emitting luminescent substance and light source comprising such a luminescent substance
    Patent number: 7791265
    Abstract: Disclosed is a luminescent substance which has the structure EA3N2Si2O4:D, wherein EA=(Sr,Ba,Ca) and D=Eu, provides red emission, and is characterized by great stability and a simple production process. Said luminescent substance can be used for many different types of light sources.
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: September 7, 2010
    Assignee: Osram Gesellschaft mit beschraenkter Haftung
    Inventors: Tim Fiedler, Wolfram Hempel, Frank Jermann
  • Red-Emitting Luminescent Substance and Light Source Comprising Such a Luminescent Substance
    Publication number: 20090212683
    Abstract: Disclosed is a luminescent substance which has the structure EA3N2Si2O4:D, wherein EA=(Sr,Ba,Ca) and D=Eu, provides red emission, and is characterized by great stability and a simple production process. Said luminescent substance can be used for many different types of light sources.
    Type: Application
    Filed: November 29, 2006
    Publication date: August 27, 2009
    Applicant: OSRAM GESELLSCHAFT MIT BESCHRÄNKTER HAFTUNG
    Inventors: Tim Fiedler, Wolfram Hempel, Frank Jermann
  • Illuminant and Light Source Containing the Same, and Method for Producing said Illuminant
    Publication number: 20090050846
    Abstract: An illumination from the class of oxynitridosilicates, doped with bivalent europium and comprising a cation M2+, said illuminant corresponding to the basic formula M(l-c)Si202N2: Dc wherein the following holds good: M?Sr(1-x)Bax mit 0.3<x<0.7.
    Type: Application
    Filed: February 19, 2007
    Publication date: February 26, 2009
    Applicant: OSRAM Gesellschaft mit Beschränkter Haftung
    Inventors: Daniel Becker, Tim Fiedler, Wolfram Hempel, Frank Jermann
  • Blue to yellow-orange emitting phosphor, and light source having such a phosphor
    Patent number: 7489073
    Abstract: The phosphor having the composition xAE2SiO4:D.yREN, in which AE=(Sr, Ba, Ca, Mg) and D=Eu, and RE=La, Y, delivers a blue to yellow-orange emission and is distinguished by a high efficiency. It can be used for a very wide range of light sources.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: February 10, 2009
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventors: Tim Fiedler, Wolfram Hempel, Frank Jermann
  • Blue to yellow-orange emitting phosphor, and light source having such a phosphor
    Publication number: 20060232193
    Abstract: The phosphor having the composition xAE2SiO4:D.yREN, in which AE=(Sr, Ba, Ca, Mg) and D=Eu, and RE=La, Y, delivers a blue to yellow-orange emission and is distinguished by a high efficiency. It can be used for a very wide range of light sources.
    Type: Application
    Filed: April 10, 2006
    Publication date: October 19, 2006
    Applicant: Patent-Treuhand-Gesellschaft fur elektrische Gluhlamplen mbH
    Inventors: Tim Fiedler, Wolfram Hempel, Frank Jermann