Patents by Inventor Chandrasekhar Krishnan

Chandrasekhar Krishnan 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).

  • Process for reducing corrosion in a system for separating aromatic hydrocarbons from a mixture with aliphatic hydrocarbons
    Patent number: 5879540
    Abstract: Disclosed is a process for reducing corrosion in a system in which aromatic hydrocarbons are separated from a mixture with aliphatic hydrocarbons. The aromatic hydrocarbons are extracted from the mixture using an extracting solvent. The aromatic hydrocarbons are stripped from the extracting solvent with steam and the steam is condensed to form water which is separated from the aromatic hydrocarbons. The separated water is passed through a basic anion exchange column and is then heated to produce the steam.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: March 9, 1999
    Assignee: Occidental Chemical Corporation
    Inventors: Kevin Zinke, Dean Lagerwall, Mohan Saran, David Albright, David Harrigan, Chandrasekhar Krishnan
  • Determination of diffusion coefficient
    Patent number: 5627329
    Abstract: Disclosed is a method of determining a diffusion coefficient for a diffusant in a particulate. An inert gas is passed through a particulate containing the diffusant. A parameter that is proportional to the concentration of the diffusant in the inert gas is measured over a period of time and the slope of the linear portion of that relationship is determined and is multiplied by a constant.
    Type: Grant
    Filed: September 13, 1995
    Date of Patent: May 6, 1997
    Assignee: Occidental Chemical Corporation
    Inventors: Chandrasekhar Krishnan, Jian S. Qi, Joseph A. Incavo, William L. Reuter, Vivek Jain
  • Process for preparing chloro-N-phenylphthalimide
    Patent number: 5264588
    Abstract: Disclosed is a method of preparing a chloro-N-phenylphthalimide. A solution is prepared of a chlorophthalic acid or anhydride and aniline in water as the only solvent and the solution is heated to produce the product. The preferred chlorophthalic acid is 3,4,6-trichlorophthalic acid.
    Type: Grant
    Filed: September 17, 1992
    Date of Patent: November 23, 1993
    Assignee: Occidental Chemical Corporation
    Inventor: Chandrasekhar Krishnan