Patents by Inventor Arnold Hofer

Arnold Hofer 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 mixtures containing advancement catalysts
    Patent number: 5521261
    Abstract: Epoxy resin compositions comprising an epoxy resin which is liquid at room temperature and has on average more than one epoxy group per molecule and a quaternary perhydroazepinium salt or a quaternary octahydroazocinium salt as advancement catalyst, when advanced with compounds having two phenolic hydroxyl groups, give excellent products having low viscosity and good viscosity stability, which products can be used, for example, for surface protection, preferably as binder for coatings and paints.
    Type: Grant
    Filed: May 27, 1994
    Date of Patent: May 28, 1996
    Assignee: Ciba-Geigy Corporation
    Inventors: Arnold Hofer, Hildegard Schneider, Nikolaus Siegenthaler
  • Novel epoxy resins
    Patent number: 5019639
    Abstract: Advanced epoxy resins are disclosed which can be obtained by reacting liquid or semi-solid aromatic opoxy resins with aliphatic diols, and subsequently reacting the reaction product with mono- or binuclear bisphenols in the presence of a cyclic quaternary ammonium salt.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: May 28, 1991
    Assignee: Ciba-Geigy Corporation
    Inventors: Arnold Hofer, Alex Wegmann
  • 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
  • Pressure-sensitive recording material
    Patent number: 4431213
    Abstract: A pressure-sensitive recording material which contains, on at least one support, at least one color former and one inorganic developer therefor applied in the form of coatings, said coatings additionally containing a urea-formaldehyde condensate with a BET specific surface area of 3 to 30 m.sup.2 /g.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: February 14, 1984
    Assignee: Ciba-Geigy AG
    Inventors: Arnold Hofer, Rene Graf, James H. Astbury