Patents by Inventor Wilhelm P. H. Voors

Wilhelm P. H. Voors 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).

  • Patent number: 4540287
    Abstract: This invention provides a hot-mix asphalt recycling processes for reconstituting and upgrading old road materials. In usual hot-mix plants the asphaltic material is heated by a naked flame. Residual bitument in the asphalt is exposed to the naked flame from the burner, which can seriously damage the bitument and render it largely worthless. In order to reduce wastage, the invention provides for heating of aggregate in a heating zone, and supplying of the heated aggregate, usually cold reclaimed asphalt, and suitable binder material to a substantially flame-free mixing zone. By mixing these constituents in that zone, it is possible to produce a usable hot asphalt pavement mix with reduced asphalt wastage.
    Type: Grant
    Filed: December 1, 1983
    Date of Patent: September 10, 1985
    Assignee: South African Inventions Development Corp.
    Inventors: Vladimiros Servas, Wilhelm P. H. Voors