Patents by Inventor John W. Dugat

John W. Dugat 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).

  • Patent number: 4725362
    Abstract: Method and apparatus for treatment of oilfield wastes, so that the wastes may be disposed of without harm to the environment or may be recovered as valuable products, wherein the wastes are pretreated to enhance separation of solid materials, the solid materials being dried and incinerated to a char solids condition, the char solids and the heating gases being cooled by heat exchange to provide hot air for combustion in the dryer-incinerator, thereby saving heating fuel cost, the gases being scrubbed to remove contaminants, and the condensed water-hydrocarbon phases being separated for reuse or for further treatment for recovery.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: February 16, 1988
    Inventor: John W. Dugat