Patents by Inventor Cornelis A. M. Hoefs

Cornelis A. M. Hoefs 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).

  • Water-reducible coating composition based on an epoxy resin
    Patent number: 4737530
    Abstract: The invention provides a water-reducible coating composition comprising an epoxy resin, an amino group-containing curing agent for the epoxy resin and a formic acid ester having a solubility of at least 0.2 g in 100 g of water of a temperature of 20.degree. C., with the exception of tert. butyl formiate.
    Type: Grant
    Filed: April 28, 1987
    Date of Patent: April 12, 1988
    Assignee: Akzo N.V.
    Inventors: Cornelis A. M. Hoefs, Pieter Oosterhoff
  • Water reducible composition based on an epoxy resin
    Patent number: 4598108
    Abstract: The invention provides a water-reducible coating composition comprising an epoxy resin, an amino group-containing curing agent for the epoxy resin and a watersoluble organic compound which occurs in at least 2 tautomeric forms, in one of which a labile hydrogen atom is linked to a carbon atom and which compound contains at least one carbonyloxy group or sulfonyl group.
    Type: Grant
    Filed: June 27, 1985
    Date of Patent: July 1, 1986
    Assignee: Akzo NV
    Inventor: Cornelis A. M. Hoefs
  • Time temperature indicating device
    Patent number: 4154107
    Abstract: There is provided a time temperature device having an indicator layer which visually indicates the lapse of a time temperature integral. A signaling component is provided which, upon contact with the indicating layer, causes the indicator layer to undergo a visually perceptive change. The device further includes a reservoir for the signaling component, including a first backing and adhesive layer containing an adhesive substance. The adhesive layer is positioned between the indicating layer and the first backing.
    Type: Grant
    Filed: March 7, 1978
    Date of Patent: May 15, 1979
    Assignee: Akzona Incorporated
    Inventors: Egenius A. Giezen, Cornelis A. M. Hoefs, Abram Opschoor, Eduard M. Verhulst