Patents by Inventor Hans E. Asp

Hans E. Asp 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 cleaning a filter surface in situ in a pressure filtering apparatus for liquids and pressure filtering apparatus for carrying out the method
    Patent number: 4358383
    Abstract: Cleaning a filter surface (16) in situ in a filer housing (10) forming part of a pressure filtering apparatus for liquids is carried out by drying the coating deposited on the filter surface by means of hot air which is caused to flow at a moderate rate through the suspension chamber (5) of the filter housing in a direction over and substantially parallel to the sludge-coated filter surface. The dried coating is detached from the filter surface and removed from the suspension chamber by means of compressed air which alternately with the hot air and at a substantially higher rate than the latter also is caused to flow in a direction over and substantially parallel to the filter surface.
    Type: Grant
    Filed: March 1, 1981
    Date of Patent: November 9, 1982
    Inventor: Hans E. Asp