Patents by Inventor Nirmal Chatterjee

Nirmal Chatterjee 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 hydrogen using methanation and pressure swing adsorption
    Patent number: 6379645
    Abstract: A process for recovering hydrogen products from a hydrogen/carbon oxide synthesis gas wherein removal of carbon oxides is accomplished in a pressure swing adsorption unit, by operating the pressure swing adsorption unit until carbon oxides break through into the effluent from the pressure swing adsorption unit, followed by passing the effluent from the pressure swing adsorption unit through a methanator to remove breakthrough carbon oxides from the pressure swing adsorption effluent.
    Type: Grant
    Filed: October 14, 1999
    Date of Patent: April 30, 2002
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Donald Peter Bucci, John Michael Repasky, Nirmal Chatterjee, Gregory David Snyder
  • Liquefaction of natural gas using process-loaded expanders
    Patent number: 4970867
    Abstract: A process for the liquefaction of natural gas is disclosed wherein expansion valves for low-level multicomponent refrigerant and liquefied gas product streams are replaced with process-loaded turboexpanders having liquid inlet streams. Each turboexpander is coupled with a compressor or pump so that expansion work extracted from a given stream is used directly to compress or pump the stream prior to cooling and expansion. The use of process-loaded turboexpanders reduces the minimum work of liquefaction and increases the liquefaction capacity of the process.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: November 20, 1990
    Assignee: Air Products and Chemicals, Inc.
    Inventors: D. Michael Herron, Nirmal Chatterjee