Patents by Inventor Guido Matthijs

Guido Matthijs 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).

  • Method for the production of tetramethylthiuram disulfide
    Patent number: 6420602
    Abstract: The present invention relates to a novel method for the production of tetramethylthiuram disulfide, in which dimethylammonium dimethyldithiocarbamate is oxidized in aqueous solution with oxygen, in the presence of carbon disulfide and a lignosulfonate.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: July 16, 2002
    Assignee: UCB, S.A.
    Inventors: Guido Matthijs, Patrick Christiaens, August Van Gysel
  • Continuous process for producing an aqueous solution of ferric chloride
    Patent number: 4066748
    Abstract: An aqueous solution of ferric chloride directly usable for purifying water is produced from a pickling liquor containing ferrous chloride by a process comprising the steps of1. continuously concentrating the pickling liquor by evaporation to at least about 34.25% by weight ferrous chloride concentration;2. continuously neutralizing the resulting concentrated liquor, which still contains free hydrochloric acid, by means of a fluidized bed of iron oxide particles (e.g. mill scales); and3. continuously countercurrently chlorinating the resulting neutralized concentrated liquor in two successive reaction zones, to the extent of from 73 to 86% at a temperature of from 35.degree. to 75.degree. C in the first reaction zone and the balance at a temperature of from 40.degree. to 100.degree. C in the second reaction zone.The product of said process is an aqueous solution containing per liter at least 40% by weight of ferric chloride, less than 0.1% by weight of ferrous chloride and less than 0.
    Type: Grant
    Filed: August 13, 1976
    Date of Patent: January 3, 1978
    Assignee: U C B, Societe Anonyme
    Inventors: Jean-Marie Lietard, Guido Matthijs
  • Process for the preparation of maleic anhydride from maleic acid in the presence of sulfolane
    Patent number: 4009186
    Abstract: Process for the preparation of maleic anhydride from maleic acid by heating the latter in the presence of an organic solvent, which comprises using sulfolane as the organic solvent.
    Type: Grant
    Filed: July 10, 1975
    Date of Patent: February 22, 1977
    Assignee: U. C. B., Societe Anonyme
    Inventors: Jean-Marie Lietard, Guido Matthijs