Patents by Inventor John Keller Howell

John Keller Howell 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).

  • Cryogenic system for producing ultra-high purity nitrogen
    Patent number: 5983667
    Abstract: A process for further purification of nitrogen gas, thereby producing ultra-high purity nitrogen which is substantially free of hydrogen, oxygen and carbon monoxide, wherein the nitrogen gas is contacted with a metal-containing adsorbent at a temperature of 150 K. or less.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: November 16, 1999
    Assignee: Praxair Technology, Inc.
    Inventors: Mary Louise Markowski, Thomas John Bergman, Jr., James Philip Natwora, Jr., John Keller Howell, David Richard Thompson
  • Cryogenic rectification system with integral product boiler
    Patent number: 5901578
    Abstract: A cryogenic rectification system wherein a product boiler is incorporated into the primary heat exchanger without encountering boiling to dryness problems wherein liquid from the cryogenic rectification plant is processed in a phase separator upstream of the product boiler, and fluid from the product boiler is passed into the phase separator prior to recovery.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: May 11, 1999
    Assignee: Praxair Technology, Inc.
    Inventors: Kenneth Kai Wong, Michael James Lockett, Dante Patrick Bonaquist, Vijayaraghavan Srinivasan, John Keller Howell