Patents by Inventor John Joustra

John Joustra 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