Patents by Inventor Anne Witte

Anne Witte 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).

  • Halogen-free, pentane-blown, flame-retardant rigid polyurethane foam and a process for its production
    Patent number: 6593385
    Abstract: The invention relates to a halogen-free, pentane-blown, flame-retardant rigid polyurethane foam, wherein oxalkylated alkylphosphonic acids are present as flame retardants. The invention further relates to a process for producing halogen-free, pentane-blown, flame-retardant rigid polyurethane foams, which comprises using oxalkylated alkylphosphonic acids as flame retardants. Finally, the invention also relates to the use of oxalkylated alkylphosphonic acids of the formula I as halogen-free flame retardants for producing flame-retardant rigid polyurethane foams.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: July 15, 2003
    Assignee: Clariant GmbH
    Inventors: Anne Witte, Wilfried Krieger
  • Halogen-free, water-blown, flame-retardant rigid polyurethane foam and a process for its production
    Patent number: 6518325
    Abstract: The invention relates to a halogen-free, water-blown, flame-retardant rigid polyurethane foam, which comprises oxalkylated alkylphosphonic acids as flame retardant. The invention further relates to a process for producing halogen-free, water-blown, flame-retardant rigid polyurethane foams, which comprises using oxalkylated alkylphosphonic acids as flame retardant. Finally, the invention relates also to the use of oxalkylated alkylphosphonic acids of the formula I as halogen-free flame retardants for producing flame-retardant rigid polyurethane foams.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: February 11, 2003
    Assignee: Clariant GmbH
    Inventors: Anne Witte, Wilfried Krieger
  • Halogen-free, flame-retardant rigid polyurethane foam and a process for its production
    Patent number: 6472448
    Abstract: The invention relates to a halogen-free, flame-retardant rigid polyurethane foam, wherein a combination of oxalkylated alkylphosphonic acids and ammonium polyphosphate is present as flame retardant, and to a process for its production. The invention also relates to the use of oxalkylated alkylphosphonic acids in a mixture with ammonium polyphosphate for producing halogen-free, flame-retardant rigid polyurethane foams of this type.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: October 29, 2002
    Assignee: Clariant GmbH
    Inventors: Anne Witte, Wilfried Krieger
  • Halogen-free, flame-retardant rigid polyurethane foam and a process for its production
    Publication number: 20010036973
    Abstract: The invention relates to a halogen-free, flame-retardant rigid polyurethane foam, wherein a combination of oxalkylated alkylphosphonic acids and ammonium polyphosphate is present as flame retardant, and to a process for its production.
    Type: Application
    Filed: March 27, 2001
    Publication date: November 1, 2001
    Applicant: Clariant GmbH
    Inventors: Anne Witte, Wilfried Krieger
  • Halogen-free, water-blown, flame-retardant rigid polyurethane foam and a process for its production
    Publication number: 20010034377
    Abstract: The invention relates to a halogen-free, water-blown, flame-retardant rigid polyurethane foam, which comprises oxalkylated alkylphosphonic acids as flame retardant.
    Type: Application
    Filed: March 27, 2001
    Publication date: October 25, 2001
    Applicant: Clariant GmbH
    Inventors: Anne Witte, Wilfried Krieger
  • Halogen-free, pentane-blown, flame-retardant rigid polyurethane foam and a process for its production
    Publication number: 20010034388
    Abstract: The invention relates to a halogen-free, pentane-blown, flame-retardant rigid polyurethane foam, wherein oxalkylated alkylphosphonic acids are present as flame retardants.
    Type: Application
    Filed: March 27, 2001
    Publication date: October 25, 2001
    Applicant: Clariant GmbH
    Inventors: Anne Witte, Wilfried Krieger