Patents by Inventor Frank W. Bowdish

Frank W. Bowdish 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).

  • Process for leaching sand or other particulate material
    Patent number: 4042671
    Abstract: A process for leaching sand to remove iron and other undesirable components in which the sand is treated with a series of leaching solutions which increase in acid concentration to about the midpoint of the process followed by decrease in concentration to a final wash water with the initial drainage from the sand mass being discarded while subsequent drainages are re-used for subsequent leaching operations with the addition of leaching acid to some of the drainage to provide the desired acid concentration.
    Type: Grant
    Filed: July 10, 1975
    Date of Patent: August 16, 1977
    Inventor: Frank W. Bowdish