Patents by Inventor Harald Ersdal

Harald Ersdal 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).

  • Mechanical sorting system for crude silicon carbide
    Patent number: 4728043
    Abstract: A process for purifying crude silicon carbide lumps from an Acheson furnace comprising agitating the lumps in a drum having a cylindrical wall, its axis substantially horizontal and having openings of controlled size, smaller than said crude lumps, in said cylindrical wall, separating the particles passing through said controlled size openings according to size and recirculating oversize particles back to said rotating drum and finally recovering product retained in said drum.
    Type: Grant
    Filed: February 25, 1982
    Date of Patent: March 1, 1988
    Assignee: Norton Company
    Inventors: Harald Ersdal, Kjell A. Stole