Patents by Inventor Gijsbert W. van Wijk

Gijsbert W. van Wijk 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, purifying a melt, which, besides one or more impurities, essentially contains a light metal, in particular aluminum
    Patent number: 4897115
    Abstract: Apparatus for purifying a melt which, besides one or more impurities to be volatilized, contains essentially a light metal, in particular aluminum. The apparatus comprises a vacuum processing vessel, a vacuum pump, one or more conduits for supplying the melt to the vacuum processing vessel and means for spraying the melt into the vacuum processing vessel. According to the invention, the vacuum processing vessel is provided with discharge means for discharging impurities expelled from the melt. The discharge means are connected to a means for separating the impurities in solid or liquid form, connected to the vacuum pump used for maintaining the subatmospheric pressure in the vacuum processing vessel. Connected to the vacuum processing vessel are at least one supply conduit and one return conduit for the melt, the supply conduit being provided with a pump for the melt to be purified and a spray nozzle for atomizing the melt supplied by the pump into the vacuum processing vessel.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: January 30, 1990
    Inventor: Gijsbert W. van Wijk