Patents by Inventor John J. Pietruszewski

John J. Pietruszewski 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).

  • Oxygen enriched air system
    Patent number: 4867766
    Abstract: Enriched oxygen from a pressure swing adsorption system and air are blended to provide oxygen enriched air of desired purity, particularly for use at flow rates between those for which liquid oxygen and on-site cryogenic air separation plants are desirable.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: September 19, 1989
    Assignee: Union Carbide Corporation
    Inventors: Michael J. Campbell, James Smolarek, John J. Pietruszewski
  • Turndown control for pressure swing adsorption
    Patent number: 4140495
    Abstract: During periods of reduced product withdrawal rate the variable adsorption pressure type of pressure swing adsorption system is controlled by monitoring a product gas flow characteristic and advancing the cycle from its cocurrent depressurization step so as to maintain the product gas withdrawal quantity as a direct and predetermined function of the reduced withdrawal rate.
    Type: Grant
    Filed: May 27, 1977
    Date of Patent: February 20, 1979
    Assignee: Union Carbide Corporation
    Inventor: John J. Pietruszewski
  • Oxygen enriched air system
    Patent number: RE34434
    Abstract: Enriched oxygen from a pressure swing adsorption system and air are blended to provide oxygen enriched air of desired purity, particularly for use at flow rates between those for which liquid oxygen and on-site cryogenic air separation plants are desirable.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: November 9, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Michael J. Campbell, James Smolarek, John J. Pietruszewski