Patents by Inventor Douglas H. Blackburn

Douglas H. Blackburn 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).

  • Ultraviolet Faraday rotator glass
    Patent number: 5364819
    Abstract: A Faraday rotator glass composition based on a fluoride glass, phosphate glass, fluorophosphate glass or a mixture thereof is doped with a lanthanide in a concentration sufficient to provide a Verdet constant above at least 2870 deg/Tesla-meter [(1 min/cm-Oe).times.(1.667.times.10.sup.4)=1 deg/Tesla-meter] and optical transmission above at least 50 percent in a 25 mm thick polished glass sample at least at one wavelength in the 200 to 400 nm wavelength region. The Faraday rotator glass also includes monovalent non-lanthanide cations such as Na, Li, K or mixtures thereof in a concentration sufficient to provide a Verdet constant above at least 2870 deg/Tesla-meter and optical transmission above at least 50 percent in a 25 mm thick polished glass sample at least at one wavelength in the 200 to 400 nm wavelength region.
    Type: Grant
    Filed: April 28, 1993
    Date of Patent: November 15, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: James L. Dexter, David G. Cooper, Douglas H. Blackburn, David C. Cranmer, Dale A. Kauffman
  • Neutron absorbing glass compositions
    Patent number: 5221646
    Abstract: Neutron absorbing glass compositions comprise SiO.sub.2, .sup.6 Li.sub.2 O and optionally Al.sub.2 O.sub.3. The compositions may further include PbO. The compositions provide neutron absorption without release of gamma rays.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: June 22, 1993
    Assignee: The United States of America as represented by the Secretary of Commerce
    Inventors: Douglas H. Blackburn, Craig Stone, David C. Cranmer, Dale A. Kauffman, James Grundl