Patents by Inventor Ralph Stephen Hall

Ralph Stephen Hall 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).

  • Infrared optical system
    Patent number: 6091069
    Abstract: An infrared optical system incorporates a lens for imaging a remote scene onto a detector within a cold shield. Stray radiation incident on the detector is reduced by an optical stop in the form of a light emitting diode producing negative luminescence. The LED emits less radiation than background, and contributes less to the detector photon noise than an optical stop not exhibiting negative luminescence.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: July 18, 2000
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Timothy Ashley, Charles Thomas Elliott, Neil Thomson Gordon, Ralph Stephen Hall