Patents by Inventor William L. Hamrick

William L. Hamrick 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).

  • Combination above grade automatic method of stormwater separation and filtration
    Patent number: 6171507
    Abstract: A method and system for treating stormwater runoff containing impurities includes collecting the runoff in a basin and allowing the runoff to settle in the basin for a predetermined time before allowing the filtration step to be initiated. The time delay is controlled by a controller sensitive rain fall, turbidity, or other variables selected by the user. During the filtration step a separator member is positioned floatingly between a filter element and impurities floating on the surface of the unfiltered water.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: January 9, 2001
    Assignee: SWAF, Inc.
    Inventors: John R. Roy, David L. Earl, William L. Hamrick, Philip G. King
  • Combination above grade automatic stormwater separation filtration system and method of separation and filtration
    Patent number: 6077423
    Abstract: A method and system for treating stormwater runoff containing impurities includes collecting the runoff in a basin and allowing the runoff to settle in the basin for a predetermined time before allowing the filtration step to be initiated. The time delay is controlled by a controller sensitive to rain fall, turbidity, or other variables selected by the user. During the filtration step a separator member is positioned floatingly between a filter element and impurities floating on the surface of the unfiltered water.
    Type: Grant
    Filed: September 21, 1998
    Date of Patent: June 20, 2000
    Assignee: SWAF, Inc.
    Inventors: John R. Roy, David L. Earl, William L. Hamrick, Philip G. King