Patents by Inventor Ursula E. Laak

Ursula E. Laak 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).

  • Subterranean fluid filtering and drainage system
    Patent number: 4880333
    Abstract: A subterranean drainage and fluid filtration system includes an inlet conduit defined by fluid filtering fabric encasing a fluid pervious panel with raised lands and depressions to define passageways for the fluid. The fluid flows downwardly into a filtration system comprising the serpentine wrapped filter fabric in which core sheets and spacers are provided. These core sheets and spacers may be identical to one another and each includes raised lands so as to achieve flow of fluid downwardly and horizontally through the fluid filter.
    Type: Grant
    Filed: July 22, 1988
    Date of Patent: November 14, 1989
    Inventors: Joseph Glasser, Ursula E. Laak