Patents by Inventor Andre Verhelst

Andre Verhelst 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 treating an acidic waste water stream
    Patent number: 4035293
    Abstract: Disclosed is a process for purifying an effluent containing acids such as phosphonic and phosphoric acids by the addition of CaO or Ca(OH).sub.2 in an amount ranging from 55-93 per cent by weight basis acids at a temperature of 35.degree. to 100.degree. C to a pH of 8 to 12. After removing the precipitated material, the effluent can be neutralized with CO.sub.2 gas. The precipitate can be calcined to tri calcium phosphate.
    Type: Grant
    Filed: July 17, 1975
    Date of Patent: July 12, 1977
    Assignee: S.A. Texaco Belgium N.V.
    Inventors: Antoine Benoit, Sylvain A. R. Dewaele, Andre Verhelst