Patents by Inventor David A. Prado

David A. Prado 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).

  • Solar collector
    Patent number: 4149525
    Abstract: A solar collector having the shape of a step pyramid which is enclosed within a transparent dome and a bottom insulating layer. A continuous coil of tubing conforming to the same shape as the step pyramid is in contact with each successive step. Because of this shape, the collector receives solar radiation during all daylight hours without the use of mirrors or tracking devices.
    Type: Grant
    Filed: October 14, 1977
    Date of Patent: April 17, 1979
    Inventor: David A. Prado