Patents by Inventor Stuart A. Gairns

Stuart A. Gairns 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).

  • Apparatus for the self-cleaning of process tubes
    Patent number: 5890531
    Abstract: Periodic self-cleaning apparatus of use in combination with a process tube which receives a process fluid therethrough such as a tubular reactor to form a looped system having a launching and receiving chamber for a cleaning device or pig which is propelled periodically through the tube by the motive force of the fluid to clean the tube without disrupting the continuous unidirectional flow of the fluid. The pig need not be spherical and extraneous fluid pumps are not needed.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: April 6, 1999
    Assignee: Noram Engineering and Constructors Ltd.
    Inventors: Stuart A. Gairns, John Joustra
  • Method and apparatus for recovering wash water from pulp and paper mill effluent
    Patent number: 5470481
    Abstract: A method and apparatus for recovering wash water from effluent generated by a pulp and paper mill. The method includes filtering at least a portion of the effluent to form a filtrate stream and an organic solids feed stream. The organic solids feed stream is exposed to a temperature and a pressure which are supercritical for water to cause a substantial portion of the organic component to oxidize and form a product stream that, when cooled, includes a gaseous component, an inorganic solids component, and a liquid wash water component. The wash water component is separated from the gaseous and inorganic solids components, thereby recovering wash water.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: November 28, 1995
    Assignee: Modell Environmental Corporation
    Inventors: Michael Modell, Edward G. Hauptmann, Stuart A. Gairns