Patents by Inventor Johannes Kirchhof

Johannes Kirchhof 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).

  • Hydrogen-supported fluorination of soot bodies
    Patent number: 9416044
    Abstract: The invention relates to a method for fluorinating a soot body. The method involves: a) providing a soot body, and b) treating the soot body with a gas mixture containing hydrogen and CnF2n+2 (n=1 or 2) at a temperature in the range of (1,280-n*250)° C. to (1,220-n*100)° C.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: August 16, 2016
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Martin Trommer, Malte Schwerin, Stephan Grimm, Frank Froehlich, Johannes Kirchhof
  • HYDROGEN-SUPPORTED FLUORINATION OF SOOT BODIES
    Publication number: 20150259238
    Abstract: The invention relates to a method for fluorinating a soot body. The method involves: a) providing a soot body, and b) treating the soot body with a gas mixture containing hydrogen and CnF2n+2 (n=1 or 2) at a temperature in the range of (1,280-n*250)° C. to (1,220-n* 100)° C.
    Type: Application
    Filed: September 6, 2013
    Publication date: September 17, 2015
    Inventors: Martin Trommer, Malte Schwerin, Stephan Grimm, Frank Froehlich, Johannes Kirchhof
  • Method for producing doped quartz glass
    Patent number: 8557171
    Abstract: The invention relates to a method allowing cost-effective production of doped quartz glass, particularly laser-active quartz glass, that is improved with regard to the homogeneity of the doping material distribution, in that a suspension is provided comprising SiO2 particles and an initial compound for at least one doping material in an aqueous fluid, the fluid being removed under formation of a doped intermediate product comprising particles of the doping material or particles of the precursor substance or the doping material, and the doped quartz glass is formed by sintering the doped intermediate product, wherein at least part of the particles of the doping material or the particles of the precursor substance of the same is generated in the suspension as a precipitate of a pH-value-controlled precipitation reaction of the initial compound.
    Type: Grant
    Filed: September 18, 2008
    Date of Patent: October 15, 2013
    Assignees: Heraeus Quarzglas GmbH & Co. KG, Institut fur Photonische Technologien
    Inventors: Andreas Langner, Thomas Kayser, Gerhard Schoetz, Mario Such, Johannes Kirchhof, Stephan Grimm, Volker Reichel
  • METHOD FOR PRODUCING DOPED QUARTZ GLASS
    Publication number: 20100251771
    Abstract: The invention relates to a method allowing cost-effective production of doped quartz glass, particularly laser-active quartz glass, that is improved with regard to the homogeneity of the doping material distribution, in that a suspension is provided comprising SiO2 particles and an initial compound for at least one doping material in an aqueous fluid, the fluid being removed under formation of a doped intermediate product comprising particles of the doping material or particles of the precursor substance or the doping material, and the doped quartz glass is formed by sintering the doped intermediate product, wherein at least part of the particles of the doping material or the particles of the precursor substance of the same is generated in the suspension as a precipitate of a pH-value-controlled precipitation reaction of the initial compound.
    Type: Application
    Filed: September 18, 2008
    Publication date: October 7, 2010
    Applicants: HERAEUS QUARZGLAS GMBH & CO. KG, INSTITUT FUER PHOTONISCHE TECHNOLOGIEN E.V.
    Inventors: Andreas Langner, Thomas Kayser, Gerhard Schoetz, Mario Such, Johannes Kirchhof, Stephan Grimm, Volker Reichel