Patents by Inventor Erik Qvale Dahl

Erik Qvale Dahl 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 of recovering fluorine from carbonaceous waste material
    Patent number: 4065551
    Abstract: Particles of solid carbonaceous waste material which contain fluorine are suspended in a stream of gas consisting of a mixture of steam and air to establish a fluidized bed in a retort. The particles are heated to a temperature of not less than 1000.degree. C to cause pyrohydrolysis and the recovery of fluorine as gaseous hydrogen fluoride at a very efficient rate.
    Type: Grant
    Filed: March 1, 1976
    Date of Patent: December 27, 1977
    Assignee: Elkem-Spigerverket A/S
    Inventor: Erik Qvale Dahl