Patents by Inventor Edward J. Stevens

Edward J. Stevens 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).

  • Microparticles with visual identifying means
    Patent number: 4390452
    Abstract: Microparticles encoded for retrospective identification of substances into which they are incorporated. The novel microparticles have flat surfaces bearing repetitive identifying indicia such as alphanumerics which can be visually interpreted under magnification. The indicia may provide only part or all of the code.
    Type: Grant
    Filed: August 20, 1979
    Date of Patent: June 28, 1983
    Assignee: Minnesota Mining & Manufacturing Company
    Inventor: Edward J. Stevens