Patents by Inventor David H. Douglass

David H. Douglass 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).

  • Methods and apparatus for providing ultra-stable frequency standards and clocks
    Patent number: 4242611
    Abstract: Improved clocks and frequency standards are provided through the use of single crystals having a mass of the order of kilograms maintained at temperatures of the orders of few degrees Kelvin which are caused to vibrate freely at low modes of resonant vibration. The frequency stability of such vibrations is ultra-stable over long periods of time and provide frequency standards and clocks having stability orders of magnitude greater than clocks and standards based upon quartz crystal oscillators and equal or better than standards and clocks based upon atomic beams (cesium, rubidium and hydrogen masers).
    Type: Grant
    Filed: May 23, 1977
    Date of Patent: December 30, 1980
    Assignee: The University of Rochester
    Inventor: David H. Douglass