Patents by Inventor Stefan Keipl

Stefan Keipl 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).

  • Water based liquid foam extinguishing formulation
    Patent number: 6814880
    Abstract: A liquid foam extinguishing formulation comprising a water soluble ammonium salt, a film-forming amphoteric fluorine surfactant, a foam-forming amphoteric co-surfactant, and a frostproofing agent, wherein the formulation is a stable, storable, ready to use, and frostproof single solution.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: November 9, 2004
    Assignee: Cognis Deutschland GmbH & Co. KG
    Inventors: Robert Graf, Stefan Keipl
  • Powdery hydrophobic filler for bituminized traffic surfaces
    Patent number: 5453212
    Abstract: The invention concerns a powdery, hydrophobic filler for bituminized traffic surfaces, including at least one substance that lowers the freezing point of water.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: September 26, 1995
    Assignees: ChemischeFabrik Gruenau GmbH, Mannesmann Aktiengesellschaft
    Inventors: Dieter Annemaier, Stefan Keipl, Wilhelm Kaemereit, Oskar Schmitt
  • Fire prevention material
    Patent number: 4816312
    Abstract: The invention relates to a fire prevention material in loose form containing at least one material thermally insulating at temperatures up to 1100.degree. C.; at least one material which irreversibly expands at temperatures over 150.degree. C., particularly over 200.degree. C.; and at least one preferably finely divided binder, which is able to expand on heating. All the constituents of the material are waterproof and weatherproof, so that the fire prevention material can be frequently handled over long periods. It is preferably packed into incompletely filled bags.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: March 28, 1989
    Assignee: Chemische Fabrik Grunau GmbH
    Inventors: Dieter Annemaier, Robert Graf, Stefan Keipl