Patents by Inventor Ronald D. Openshaw

Ronald D. Openshaw 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).

  • Production of pure nitrogen
    Patent number: 4566887
    Abstract: A process and apparatus for the production of nitrogen from air by the cryogenic fractionation of the air at superatmospheric pressure and which permits the production of variable quantities of nitrogen from a constant supply of air at superatmospheric pressure by periodically distilling less than all of the air which is supplied at superatmospheric pressure and work expanding a stream of air at superatmospheric pressure provided from the balance of said supply whereby to produce additional refrigeration for the process, and recovering condensed nitrogen vapor thereby formed in excess of that required for reflux.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: January 28, 1986
    Assignee: Costain Petrocarbon Limited
    Inventor: Ronald D. Openshaw