Patents by Inventor Hans Lolk

Hans Lolk 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).

  • Filter holder
    Patent number: 4291904
    Abstract: The present invention relates to a filter bag holder comprising a flexible tubular member having a relatively constant outside diameter throughout a substantial portion of its length to one of its axial ends and having two axially spaced annular ribs protruding from the outside of the tubular member near its other axial end. The constant-diameter end may be attached to a filter bag, and the ribbed end engages in the region between the two axially spaced protruding annular ribs with a rim around an aperture in a partition located between mediums under different pressures.
    Type: Grant
    Filed: February 15, 1980
    Date of Patent: September 29, 1981
    Assignee: Arkay Packaging Corporation
    Inventors: Niels A. Iversen, Jorgen Pedersen, Hans Lolk