Patents by Inventor Dale A. Lagree

Dale A. Lagree 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).

  • Dual product pressure swing adsorption and membrane operations
    Patent number: 5207806
    Abstract: The waste gas of PSA-air separation operations is passed to a membrane system for enhanced recovery of a second product. By capturing the portion found to contain a high concentration of either nitrogen or oxygen in the waste stream, the efficiency of the overall separation is enhanced.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: May 4, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Dale A. Lagree, David R. Thompson
  • Dual product pressure swing adsorption process and system
    Patent number: 5163978
    Abstract: By capturing the portion found to contain a high concentration of either oxygen or nitrogen in the non-primary waste stream from a PSA-air separation operation, a high purity second product stream can be obtained.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: November 17, 1992
    Assignee: Praxair Technology, Inc.
    Inventors: Frederick W. Leavitt, James Smolarek, Dale A. Lagree
  • Pressure swing adsorption process for gas separation
    Patent number: 4810265
    Abstract: An improved pressure swing adsorption process enables the more readily adsorbable component of a feed gas to be economically recovered, e.g. nitrogen from air. The more readily absorbable component is used as copurge at upper adsorption pressure, and less readily adsorbable component is used for countercurrent purge at subatmospheric desorption pressure and for initial repressurization in a countercurrent backfilling step.
    Type: Grant
    Filed: December 29, 1987
    Date of Patent: March 7, 1989
    Assignee: Union Carbide Corporation
    Inventors: Dale A. Lagree, Frederick W. Leavitt