Patents by Inventor Ian Charles Jeffery

Ian Charles Jeffery 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).

  • Treatment of effluent streams containing organic acids
    Patent number: 6254779
    Abstract: An acidic organics-containing waste water stream (12) derived from for example plant for the production of an aromatic carboxylic acid such as terephthalic acid is treated to allow recovery of alkali and water for recycle to the production process. The treatment comprises adjusting the pH of the waste water stream using an alakaline medium, oxidising (10) the organics content of the stream to convert the same to water, carbon dioxide and (bi)carbonate ions, and supplying the treated stream to a reverse osmosis membrane (28, 30) to produce a retentate containing (bi)carbonate ions and cations derived from the alkaline medium and a permeate which is substantially free of those components. The retentate (46) is recycled for use in adjustment of the pH of the waste water stream and, if desired, water-consuming facilities which can tolerate less pure water.
    Type: Grant
    Filed: February 11, 2000
    Date of Patent: July 3, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ian Charles Jeffery, Christopher Howard Jackson
  • Effluent gas treatment
    Patent number: 5961942
    Abstract: Process for removing organic constituents from a high pressure exhaust gas stream in a bromine assisted air oxidation process in which the exhaust gas contains methyl bromide.
    Type: Grant
    Filed: December 5, 1997
    Date of Patent: October 5, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John Arthur Turner, Ian Charles Jeffery