Patents by Inventor Maurice L. Dubois

Maurice L. Dubois 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).

  • Filtering media for controlling the flow of sand during oil well operations
    Patent number: 4821800
    Abstract: Sand is filtered from an oil flow from a sand-containing oil producing formation or interval of an oil well by passing the oil flow with entrained sand through a filter assembly containing filtering media in the form of a body of juxtaposed composite particles. Each composite particle has an iron-containing core surrounded by a continuous chromium cladding, the composite particles having a size to permit passage of the oil flow through the body of the composite particles while substantially preventing flow of sand therethrough.
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: April 18, 1989
    Assignee: Sherritt Gordon Mines Limited
    Inventors: Leslie A. Scott, Maurice L. Dubois