Patents by Inventor Egbert Hellwig

Egbert Hellwig 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).

  • Spiral wound filter and method of making same
    Patent number: 5143575
    Abstract: The fluid filter (10) for fuel has a wound filter element (17) arranged in the housing (11) surrounded on its bottom end face (22) by a funnel-shaped welded-on cover cap (18). The cover cap (18) made of thermoplastic has an annular welding surface (25) which extends perpendicularly relative to the longitudinal axis of the filter and which is welded at least to the outermost complete turn (29) of the winding (17). An adhesive-free connection (32) between the wound filter element (17) and housing (11) thereby is formed. The preassembled wound filter element (17, 18) which can be handled easily is suitable for cold assembly on universal production lines and for different models.
    Type: Grant
    Filed: March 8, 1991
    Date of Patent: September 1, 1992
    Assignee: Robert Bosch GmbH
    Inventors: Horst Glassel, Reinhard Jaus, Egbert Hellwig