Patents by Inventor Jian S. Qi

Jian S. Qi 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).

  • 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
  • Acetic acid removal from liquid ether acetates
    Patent number: 5371279
    Abstract: Disclosed is a method of making a liquid ether acetate. After reacting acetic acid with the corresponding ether alcohol, the resulting mixture of ether acetate, water, acetic acid, and ether alcohol is, with no distillation, contacted with alumina. Particular ether acetates that can be treated include ethylene glycol monobutyl ether acetate and diethylene glycol monobutyl ether acetate. The treated acetates are more stable to hydrolysis after they have been passed over a bed of alumina.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: December 6, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Jian S. Qi, Garra C. Lester
  • Purification of 2,4,5-trifluorobenzoic acid
    Patent number: 5336806
    Abstract: Disclosed is a process for isolating and purifying 2,4,5-trifluorobenzoic acid from a solution in a decarboxylating solvent such as NMP. The solution is neutralized with a hydroxide. This results in the formation of a salt of the 2,4,5-trifluorobenzoic acid, which precipitates. The slurry is filtered to collect the precipitated salt and the precipitated salt is dissolved in water. The aqueous solution of the salt is then acidified which results in the reformation and precipitation of the 2,4,5-trifluorobenzoic acid.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: August 9, 1994
    Assignee: Occidental Chemical Corporation
    Inventor: Jian S. Qi