Patents by Inventor Jean Qiu

Jean Qiu 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 integrating indicator device with barrier material
    Patent number: 6244208
    Abstract: A time-temperature indicator device provides a visually observable indication of the cumulative thermal exposure of an object. The device includes a substrate having a diffusely light-reflective porous matrix and a backing. The backing includes on its surface a viscoelastic indicator material for contacting the substrate and a barrier material for substantially inhibiting the lateral flow of viscoelastic indicator material between the substrate and the backing.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: June 12, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Jean Qiu, Joan M. Noyola, David J. Yarusso