Patents by Inventor Ralph Speelman

Ralph Speelman 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).

  • Aircrew controllable sunlight filter for an aircraft cockpit
    Patent number: 5271580
    Abstract: A aircrew controllable sunlight filter for preventing sunlight washout of aircraft instruments comprises as part of an otherwise conventional laminated aircraft transparency an additional ply or layer of photosensitive material positioned near the inside of the transparency. An ultraviolet light source aimed by an aircrew member at a part area of the transparency will cause the transparency to darken and reduce the amount of visible sunlight striking the aircraft instruments.
    Type: Grant
    Filed: June 1, 1992
    Date of Patent: December 21, 1993
    Inventor: Ralph Speelman