Patents by Inventor Machiel N. Duivelaar

Machiel N. Duivelaar 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 rendering harmless dangerous chemical waste
    Patent number: 4855082
    Abstract: Organic or inorganic chemical waste material is incorporated in ordinary silica-glass by mixing the two in liquid condition under pressure in a container, and thereafter cooling the mixture and solidifying it in shapes like cylinders, rods or pellets. The container may be a rotary mixing cylinder, a stationary extruder, or for inorganic material, a widened portion of a glass supply conduit wherein the mixture is vibrated.
    Type: Grant
    Filed: September 5, 1984
    Date of Patent: August 8, 1989
    Assignee: Willy De Roode
    Inventor: Machiel N. Duivelaar