Patents by Inventor Richard Marquardt, Jr.

Richard Marquardt, Jr. 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).

  • Multiple layer optical recording medium for use with two different wavelength laser beams
    Patent number: 6160787
    Abstract: A double sided (or higher multiple sided) data storing compact disc for optically recorded data has data surfaces that are separated by a thin film of wavelength selective material that passes light of one frequency and reflects light of a second (or multiple) frequency. The thin film either passively relies upon the inherent interference between light signals reflected from its upper and lower surfaces or is an active material that reflects light of one frequency and transmits light of a second frequency. A further aspect of the present invention is the method for the manufacture of such a multi-surfaced disc.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: December 12, 2000
    Assignee: WEA Manufacturing, Inc.
    Inventors: Richard Marquardt, Jr., Christopher Cookson, Anthony Pietrzykoski, John L. Orehotsky, Deborah H. Carey, Howard Price, Daniel M. Pindzola