Patents by Inventor Hal van Ryswyk

Hal van Ryswyk 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).

  • Surface-derivatized semiconductors with chemically sensitive luminescence
    Patent number: 4710476
    Abstract: The presence of certain chemicals on the emitting surface of the surface-derivatized photoluminescent semiconductor alters the characteristics of radiation emitted from said surface. This alteration is used to indicate the presence of those chemicals in the environment.
    Type: Grant
    Filed: December 20, 1985
    Date of Patent: December 1, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Arthur B. Ellis, Hal van Ryswyk