Patents by Inventor Ajit Chowdhury

Ajit Chowdhury 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).

  • Methods for recovering hydrocarbon vapors
    Patent number: 7326285
    Abstract: Vapor recovery systems and methods are disclosed in association with a denatured alcohol production system. Hydrocarbon vapors are miscible in a motive fluid that captures the vapors and forms a hydrocarbon-alcohol solution. The recovered hydrocarbons are not removed from the solution, but are used in production of the denatured alcohol.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: February 5, 2008
    Assignee: RMT, Inc.
    Inventor: Ajit Chowdhury
  • Caustic solution treatment process
    Publication number: 20060283812
    Abstract: A method for treating a spent caustic solution having a pH greater than about 10.5 includes the steps of (a) lowering the pH of the caustic solution into the range of between about 10 to 10.5 to produce a pH-modified caustic solution; (b) oxidizing the pH-modified caustic solution until the solution to produce a non-sulfide reactive oxidized solution; and (c) lowering the pH of the oxidized solution to a pH less than 9.
    Type: Application
    Filed: February 24, 2006
    Publication date: December 21, 2006
    Inventor: Ajit Chowdhury
  • Methods for recovering hydrocarbon vapors
    Publication number: 20060266215
    Abstract: Vapor recovery systems and methods are disclosed in association with a denatured alcohol production system. Hydrocarbon vapors are miscible in a motive fluid that captures the vapors and forms a hydrocarbon-alcohol solution. The recovered hydrocarbons are not removed from the solution, but are used in production of the denatured alcohol.
    Type: Application
    Filed: May 24, 2005
    Publication date: November 30, 2006
    Inventor: Ajit Chowdhury
  • System and method for remediaton of soil and groundwater
    Publication number: 20060086663
    Abstract: A system and method to treat a site includes oxygenating or ozonating the site, adding nutrients, and maintaining a low bio-chemical-oxygen-demand-to-total-kjeldahl-nitrogen (BOD5:TKN) ratio. Furthermore, the system and method maintain conditions effective to permit aerobic biological deamination of organic-nitrogen compounds and nitrification of ammonia-nitrogen compounds.
    Type: Application
    Filed: October 25, 2005
    Publication date: April 27, 2006
    Inventors: Ajit Chowdhury, Jack Anderson
  • Method for stabilizing contaminated waste
    Publication number: 20060052653
    Abstract: A method for solidifying an oil-contaminated aqueous waste in situ or ex situ includes the step of combining the oil-contaminated waste with a clay, a cement and a sulfite salt solidification agent to form a solidified waste matrix, wherein the solidification agent undergoes hydration and cementation reactions in the waste matrix in the presence of water. Optionally, heavy metal stabilizing agents can also be combined with the waste.
    Type: Application
    Filed: September 2, 2005
    Publication date: March 9, 2006
    Inventors: Ajit Chowdhury, Jeff Macri, Kevin Baker, Gregory Graf
  • Method for treating recalcitrant organic compounds
    Publication number: 20050056598
    Abstract: A method for decontaminating a recalcitrant organic compound (ROC)-contaminated matrix is disclosed. The method involves pre-treating the matrix with an oxidizing agent to release the ROC from the matrix and then exposing the released ROC to a reducing agent to convert the ROC to a non-toxic substance.
    Type: Application
    Filed: June 3, 2004
    Publication date: March 17, 2005
    Inventors: Ajit Chowdhury, Larry Kinsman, Sarah Wilk
  • Stabilization of toxic metals in a waste matrix and pore water
    Patent number: 6843617
    Abstract: A method is provided for stabilizing toxic materials in a waste matrix and in the pore water of the waste matrix. The method includes the steps of combining with the waste matrix (and pore water) an agent for controlling the oxidation-reduction potential of the matrix/water, an agent for controlling the pH of matrix/water, and an agent for adsorbing or coprecipitating the toxic material in the matrix/water.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: January 18, 2005
    Assignee: RMT, Inc.
    Inventors: Ajit Chowdhury, Lane D. Tickanen
  • Stabilization of toxic metals in a waste matrix and pore water
    Publication number: 20030165359
    Abstract: A method is provided for stabilizing toxic materials in a waste matrix and in the pore water of the waste matrix. The method includes the steps of combining with the waste matrix (and pore water) an agent for controlling the oxidation-reduction potential of the matrix/water, an agent for controlling the pH of matrix/water, and an agent for adsorbing or coprecipitating the toxic material in the matrix/water.
    Type: Application
    Filed: April 7, 2003
    Publication date: September 4, 2003
    Inventors: Ajit Chowdhury, Lane D. Tickanen
  • Process for reduction of bioaccessibility of heavy metals
    Publication number: 20020022756
    Abstract: A method for reducing leaching and bioaccessibility of a heavy metal from particulate matter includes the steps of treating the particulate matter with phosphate, chloride and iron additives; wetting the additive-containing particulate matter with water; and incubating the particulate matter at a temperature above ambient temperature for a time sufficient to achieve the goals of the invention.
    Type: Application
    Filed: April 10, 2001
    Publication date: February 21, 2002
    Inventors: Ajit Chowdhury, Thomas R. Stolzenburg