Patents by Inventor Preeti Chandra

Preeti Chandra 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).

  • Adsorption control method and controller
    Patent number: 8016914
    Abstract: The present invention provides a method and a control system for controlling an adsorbent bed unit in which an adsorbent bed concentration of an impurity within an adsorbent bed of the adsorbent bed unit is measured. The adsorbent bed concentration is controlled by manipulating the feed cycle time during which an adsorbent bed is adsorbing the impurities to maintain the adsorbent bed concentration at a targeted adsorption bed concentration. The targeted adsorption bed concentration is determined such that the product impurity concentration is maintained at product impurity concentration targets. The method and control system can incorporate a supervisory level of control reactive to product impurity concentration levels and related targets to determine the targeted adsorption bed concentration and a primary level of control that calculates the feed cycle time based upon an error between the measured and targeted adsorption bed concentrations. Proportional integral control can be used for such purposes.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: September 13, 2011
    Assignee: Praxair Technology, Inc.
    Inventors: Paul W. Belanger, Mohamed Safdar Allie Baksh, Preeti Chandra, Andrew C. Rosinski
  • Multi-port indexing drum valve for VPSA
    Patent number: 7867320
    Abstract: The present invention relates to a dual feed and dual vacuum four bed VPSA process for selectively adsorbing a component from a feed stream, e.g., nitrogen from air, to produce an oxygen-enriched gas stream using a multi-port indexing drum valve, a system comprising a multi-port indexing drum valve and method for operating such a system.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: January 11, 2011
    Assignee: Praxair Technology, Inc.
    Inventors: Mohamed Safdar Allie Baksh, Michael S. Manning, Ashwin Desai, Preeti Chandra, Paul William Belanger
  • ADSORPTION CONTROL METHOD AND CONTROLLER
    Publication number: 20100242722
    Abstract: The present invention provides a method and a control system for controlling an adsorbent bed unit in which an adsorbent bed concentration of an impurity within an adsorbent bed of the adsorbent bed unit is measured. The adsorbent bed concentration is controlled by manipulating the feed cycle time during which an adsorbent bed is adsorbing the impurities to maintain the adsorbent bed concentration at a targeted adsorption bed concentration. The targeted adsorption bed concentration is determined such that the product impurity concentration is maintained at product impurity concentration targets. The method and control system can incorporate a supervisory level of control reactive to product impurity concentration levels and related targets to determine the targeted adsorption bed concentration and a primary level of control that calculates the feed cycle time based upon an error between the measured and targeted adsorption bed concentrations. Proportional integral control can be used for such purposes.
    Type: Application
    Filed: March 25, 2009
    Publication date: September 30, 2010
    Inventors: Paul W. Belanger, Mohamed Safdar Allie Baksh, Preeti Chandra, Andrew C. Rosinski
  • MULTI-PORT INDEXING DRUM VALVE FOR VPSA
    Publication number: 20100077920
    Abstract: The present invention relates to a dual feed and dual vacuum four bed VPSA process for selectively adsorbing a component from a feed stream, e.g., nitrogen from air, to produce an oxygen-enriched gas stream using a multi-port indexing drum valve, a system comprising a multi-port indexing drum valve and method for operating such a system.
    Type: Application
    Filed: September 30, 2008
    Publication date: April 1, 2010
    Inventors: MOHAMED SAFDAR ALLIE BAKSH, Michael S. Manning, Ashwin Desai, Preeti Chandra, Paul William Belanger