Patents by Inventor Richard J. Bradshaw

Richard J. Bradshaw 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).

  • Method and apparatus for hydroattrition scrubber
    Patent number: 6691938
    Abstract: A method and apparatus are disclosed for separating target particles from surrounding materials such as separating gold particles from the clays in placer deposits. The enveloping material is converted to a slurry, then pumped into a collision chamber through pairs of opposing nozzles. Sets of slurry collide, dislodging target particles from surrounding material. The outgoing slurry is then further processed to separate the particles dislodged by the collision.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: February 17, 2004
    Assignee: Hydro-Attrition Scrubbers LLC
    Inventor: Richard J. Bradshaw
  • Method and apparatus for hydroattrition scrubber
    Publication number: 20020182981
    Abstract: A method and apparatus are disclosed for separating target particles from surrounding materials such as separating gold particles from the clays in placer deposits. The enveloping material is converted to a slurry, then pumped into a collision chamber through pairs of opposing nozzles. Sets of slurry collide, dislodging target particles from surrounding material. The outgoing slurry is then further processed to separate the particles dislodged by the collision.
    Type: Application
    Filed: May 21, 2001
    Publication date: December 5, 2002
    Inventor: Richard J. Bradshaw
  • Louvered wall
    Patent number: 4688767
    Abstract: A louvered wall is formed of spaced stacks of thin masonry blocks with elongated louvers disposed between adjacent blocks and extending longitudinally of the wall through several stacks of blocks. The middle longitudinal region of each louver is higher than its longitudinal edge regions and the upper and lower surfaces of the blocks are shaped to conform to the cross-sectional configuration of the louvers to lock the blocks and louvers against transverse movement.
    Type: Grant
    Filed: August 28, 1986
    Date of Patent: August 25, 1987
    Inventor: Richard J. Bradshaw