Patents by Inventor Thomas L. Elmquist

Thomas L. Elmquist 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).

  • Method for affixing information on read-only optical discs
    Patent number: 4961077
    Abstract: A read-only optical recording disc comprising a substrate, a metal reflective layer and an overlying protective layer, at least one of the substrate and the protective layer being light-transmissive, is marked by means of a pulsed scanning laser beam which transmits light in a patterned array through a transparent layer of the medium and indelibly marks the reflective layer of the medium without disrupting the surface continuity of the substrate and protective layer.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: October 2, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Denney L. Wilson, Geoffrey A. Rhine, Thomas L. Elmquist