Patents by Inventor Hans Gempeler

Hans Gempeler 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).

  • Epoxy resin compositions
    Patent number: 5006626
    Abstract: An epoxy resin composition comprising an epoxy resin which is solid at room temperature and contains on average more than epoxy group per molecule, and a quaternary pyrrolidinium salt as advancement catalyst.When advanced with compounds containing two phenolic hydroxyl groups, these compositions give excellent products of low viscosity which are suitable, for example, for use in powder resin coating.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: April 9, 1991
    Assignee: Ciba-Geigy Corporation
    Inventors: Arnold Hofer, Hans Gempeler
  • Epoxy resin compositions
    Patent number: 4973648
    Abstract: An epoxy resin composition comprising an epoxy resin which is solid at room temperature and contains on average more than epoxy group per molecule, and a quaternary morpholinium salt as advancement catalyst.When advanced with compounds containing two phenolic hydroxyl groups, these compositions give excellent products of low viscosity which are suitable, for example, for use in powder resin coating.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: November 27, 1990
    Assignee: Ciba-Geigy Corporation
    Inventors: Arnold Hofer, Hans Gempeler
  • Epoxy resin compositions
    Patent number: 4885354
    Abstract: An epoxy resin composition comprising an epoxy resin that is liquid at room temperature and containing on average more than one epoxy group per molecule and a quarternary piperidinium salt as advancement catalyst.When advanced with compounds having two phenolic hydroxyl groups, such compositions give excellent products of low viscosity which are suitable, for example, for use in powder coating compositions.
    Type: Grant
    Filed: October 17, 1988
    Date of Patent: December 5, 1989
    Assignee: Ciba-Geigy Corporation
    Inventors: Arnold Hofer, Hans Gempeler