Patents by Inventor Koert R. Howland

Koert R. Howland 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).

  • Roof construction for leak detection
    Patent number: 5317852
    Abstract: The layers of materials constituting the sub-roof under a water-impervious membrane are adapted to provide localized downward drainage passages to a drop-off point that is detectable from underneath the roof. The location of the leak is thus identified within a spacing of these passages. The rupture of the membrane causing the leakage is then easily repaired with a minimum disturbance to the roof structure.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: June 7, 1994
    Inventor: Koert R. Howland