Patents by Inventor Johannes Schafter

Johannes Schafter 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).

  • Process for preparing solid particles of phenolic antioxidants
    Patent number: 7498457
    Abstract: The invention relates to a process for preparing solid particles comprising a phenolic antioxidant in essentially crystalline form and to the process step of further processing the phenolic antioxidants. Solid particles are prepared from a melt of the phenolic antioxidants are added to a dispersion comprising the solid particles of the compound (I) in a mixture of an organic water-miscible solvent and water and the crystals obtained from the dispersion are separated.
    Type: Grant
    Filed: July 18, 2005
    Date of Patent: March 3, 2009
    Assignee: Ciba Specialty Chemicals Corp.
    Inventor: Johannes Schäfter
  • Process for Preparing Solid Particles of Phenolic Antioxidants
    Publication number: 20070244342
    Abstract: The invention relates to a process for preparing solid particles comprising a phenolic antioxidant in essentially crystalline form and to the process step of further processing the phenolic antioxidants. Solid particles are prepared from a melt of the phenolic antioxidants are added to a dispersion comprising the solid particles of the compound (I) in a mixture of an organic water-miscible solvent and water and the crystals obtained from the dispersion are separated.
    Type: Application
    Filed: July 18, 2005
    Publication date: October 18, 2007
    Inventor: Johannes Schafter
  • Phenolic antioxidants in crystalline form
    Patent number: 7262319
    Abstract: The invention relates to a process for preparing solid particles of a phenolic antioxidant from the IRGANOX series in the form of crystals, particularly IRGANOX 1010 and 1098, the crystal particles obtainable by the process, the further processing of the crystal particles, an aqueous dispersion comprising the phenolic antioxidant, novel crystal modifications of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] (?-form) and N,N?-hexane-1,6diyl-bis[3-(3,5-di-tert-butyl-4-hydroxypheylpropamide)] (?-form) and aqueous dispersion comprising the new crystal modifications.
    Type: Grant
    Filed: November 17, 2003
    Date of Patent: August 28, 2007
    Assignee: Ciba Specialty Chemicals Corp.
    Inventors: Daniel Rehm, Johannes Schäfter, Paul Adriaan Van Der Schaaf, Christian Guckel
  • Phenolic antioxidants in crystalline form
    Publication number: 20060189820
    Abstract: The invention relates to a process for preparing solid particles of a phenolic antioxidant from the IRGANOX series in the form of crystals, particularly IRGANOX 1010 and 1098, the crystal particles obtainable by the process, the further processing of the crystal particles, an aqueous dispersion comprising the phenolic antioxidant, novel crystal modifications of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] (?-form) and N,N?-hexane-1,6diyl-bis[3-(3,5-di-tert-butyl-4-hydroxyphenylpropionamide)] (?-form) and aqueous dispersion comprising the new crystal modifications.
    Type: Application
    Filed: November 17, 2003
    Publication date: August 24, 2006
    Inventors: Daniel Rehm, Johannes Schafter, Paul Van Der Schaaf, Christian Guckel