Patents by Inventor Mark A. Landrigan

Mark A. Landrigan 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 to detoxify aqueous based hazardous waste
    Patent number: 5221480
    Abstract: A process and apparatus is provided in which aqueous based wastes are processed to remove solids, decant phase separated product, optimize chemically for solvent specific extraction, remove toxic metals and organics via solvent extraction and remove residual metals and organics via flocculation/filtration and adsorption with activated carbon. The system employs chemical optimization of the aqueous waste stream by the addition of reagents to optimize subsequent treatment and the addition of chelating agents which inhibit the precipitation of heavy metals so that they are maintained in the waste stream as an organometallic complex which can be extracted via carbon dioxide extraction and concentrated for recovery, recycling or final disposal.
    Type: Grant
    Filed: November 19, 1991
    Date of Patent: June 22, 1993
    Assignee: Clean Harbors, Inc.
    Inventors: Alexander Schultheis, Mark A. Landrigan, Arun Lakhani
  • Method and apparatus to detoxify aqueous based hazardous waste
    Patent number: 5087370
    Abstract: A process and apparatus is provided in which aqueous based wastes are processed to remove solids, decant phase separated product, optimize chemically for solvent specific extraction, remove toxic metals and organics via solvent extraction and remove residual metals and organics via flocculation/filtration and adsorption with activated carbon. The system employs chemical optimization of the aqueous waste stream by the addition of reagents to optimize subsequent treatment and the addition of chelating agents which inhibit the precipitation of heavy metals so that they are maintained in the waste stream as an organometallic complex which can be extracted via carbon dioxide extraction and concentrated for recovery, recycling or final disposal.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: February 11, 1992
    Assignee: Clean Harbors, Inc.
    Inventors: Alexander Schultheis, Mark A. Landrigan, Arun Lakhani