Patents by Inventor Douglas Scott de Lange

Douglas Scott de Lange 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).

  • Gravity recovery system and method for recovery of heavy metals from sands and gravels
    Patent number: 9399225
    Abstract: A gravity separation system for separating and recovering heavy metal particles from a slurry of suspended particles. The separation system includes a channeling member with an interior space, for guiding a flow of a slurry of suspended particles, and a magnetic member situated external to the channeling member. The magnetic member includes a geometrically patterned array of magnets, for generating a geometrically patterned magnetic field extending into the interior space of the channeling member. Magnetic particles such as magnetite, suspended in the slurry, are assembled by the geometrically patterned magnetic field into a correspondingly patterned array of riffles within the channeling member. The array of riffles promotes the sedimentation of heavy particles from the slurry. The geometrically patterned magnetic field is interruptible, to allow disassembly of the riffles and recovery of the settled heavy particles.
    Type: Grant
    Filed: July 8, 2015
    Date of Patent: July 26, 2016
    Inventor: Douglas Scott De Lange
  • Gravity recovery system and method for recovery of heavy metals from sands and gravels
    Patent number: 9114403
    Abstract: A gravity separation system for separating and recovering heavy metal particles from a slurry of suspended particles. The separation system includes a channeling member with an interior space, for guiding a flow of a slurry of suspended particles, and a magnetic member situated external to the channeling member. The magnetic member includes a geometrically patterned array of magnets, for generating a geometrically patterned magnetic field extending into the interior space of the channeling member. Magnetic particles such as magnetite, suspended in the slurry, are assembled by the geometrically patterned magnetic field into a correspondingly patterned array of riffles within the channeling member. The array of riffles promotes the sedimentation of heavy particles from the slurry. The geometrically patterned magnetic field is interruptible, to allow disassembly of the riffles and recovery of the settled heavy particles.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: August 25, 2015
    Inventor: Douglas Scott de Lange