Patents by Inventor Abram Opschoor

Abram Opschoor 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).

  • 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