Patents by Inventor Martina Hartmann

Martina Hartmann 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).

  • Defoamers for aqueous media
    Patent number: 6552092
    Abstract: The invention relates to compositions for defoaming aqueous media, comprising as defoamers urea derivatives of the formula I where R1—is a hydrocarbon radical, preferably having 4 to 30 carbon atoms or a hydrocarbon radical, preferably having 4 to 24 carbon atoms and one nitrogen atom or a hydrocarbon radical, preferably having 4 to 30 carbon atoms and one carbonyl group, R2—is a hydrogen atom or a hydrocarbon radical, preferably having 1 to 24 carbon atoms, R3—is a hydrogen atom or a hydrocarbon radical, preferably having 1 to 24 carbon atoms, R4—is an organic radical, preferably having 2 to 30 carbon atoms, and n—is from 0 to 5; in the form of solid particles, which are obtained by crystallization from a clear homogeneous melt dispersed in a carrier medium, and a process of preparation thereof.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: April 22, 2003
    Assignee: Goldschmidt AG
    Inventors: Thomas Ebbrecht, Michael Gippert, Martina Hartmann, Wolfgang Josten, Peter Muss, Stefan Silber, Roland Sucker
  • Defoamers for aqueous media
    Publication number: 20020169217
    Abstract: The invention relates to compositions for defoaming aqueous media, comprising as defoamers urea derivatives of the formula I 1
    Type: Application
    Filed: February 5, 2002
    Publication date: November 14, 2002
    Inventors: Thomas Ebbrecht, Michael Gippert, Martina Hartmann, Wolfgang Josten, Peter Muss, Stefan Silber, Roland Sucker
  • Defoamers for aqueous media
    Patent number: 6420324
    Abstract: The invention relates to compositions for defoaming aqueous media, comprising as defoamers urea derivatives of the formula I where R1 is a hydrocarbon radical, preferably having 4 to 30 carbon atoms or a hydrocarbon radical, preferably having 4 to 24 carbon atoms and one nitrogen atom or a hydrocarbon radical, preferably having 4 to 30 carbon atoms and one carbonyl group, R2 is a hydrogen atom or a hydrocarbon radical, preferably having 1 to 24 carbon atoms, R3 is a hydrogen atom or a hydrocarbon radical, preferably having 1 to 24 carbon atoms, R4 is an organic radical, preferably having 2 to 30 carbon atoms, and n is from 0 to 5; in the form of solid particles, which are obtained by crystallization from a clear homogeneous melt dispersed in a carrier medium, and a process of preparation thereof.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: July 16, 2002
    Assignee: Goldschmidt AG
    Inventors: Thomas Ebbrecht, Michael Gippert, Martina Hartmann, Wolfgang Josten, Peter Muss, Stefan Silber, Roland Sucker