Patents Assigned to The United States of America as represented by the Administrator of the U.S. Enviromental Protection Agency
  • Polymer coated nanoparticle activation of oxidants for remediation and methods of use thereof
    Patent number: 7963720
    Abstract: Methods of decreasing the amount of one or more contaminants in contaminated soil comprise introducing polymer-coated nanoparticles into the contaminated soil, optionally with other reagents. The polymer-coated nanoparticles exhibit an enhanced ability to migrate through the soil and provide greater control of the rate of activation of other chemicals, such as oxidants, in the contaminated soil.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: June 21, 2011
    Assignees: VeruTEK, Inc., The United States of America as represented by the Administrator of the U.S. Enviromental Protection Agency
    Inventors: George E. Hoag, John B. Collins, Rajender S. Varma, Mallikarjuna N. Nadagouda
  • Fully-controlled, free-piston engine
    Patent number: 6582204
    Abstract: A free-piston engine includes at least one dual piston assembly, each of which has a pair of axially opposed combustion cylinders and free-floating combustion pistons respectively mounted in the combustion cylinders for reciprocating linear motion responsive to successive combustions. A pumping piston extends from and is fixed to each of the combustion pistons and reciprocates within a hydraulic cylinder located between paired combustion cylinders. The paired combustion cylinders are rigidly connected by a cage for reciprocating movement in tandem.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: June 24, 2003
    Assignee: The United States of America as represented by the Administrator of the U.S. Enviromental Protection Agency
    Inventor: Charles L. Gray, Jr.