Patents by Inventor Hendrik A. Van De Venter

Hendrik A. Van De Venter 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).

  • Coal derived oxidation product for seedling growth stimulation
    Patent number: 5302524
    Abstract: A method of stimulating seedling growth which comprises applying a coal-derived oxidation product to the medium in which the seedling is growing. The product is in the form of a solution or a slurry having a pH in the range of 2 to 12 and has the following elemental and functional group analysis (on an air-dried basis):______________________________________ ELEMENTAL ANALYSIS Element Range (%) ______________________________________ Carbon 30-70 Hydrogen 2-6 Nitrogen 0.1-5 Sulphur 0.1-10 Oxygen 15-45 ______________________________________ FUNCTIONAL GROUP ANALYSIS Functional Group Range (meq/g) ______________________________________ Total acidity 3-13 Carboxylic groups 0.5-12 Phenolic groups 0.
    Type: Grant
    Filed: May 14, 1990
    Date of Patent: April 12, 1994
    Assignee: National Energy Council
    Inventors: Hendrik A. Van De Venter, Johannes Dekker, Izak J. Cronje