Patents by Inventor Danny L. Fread

Danny L. Fread 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 and system for developing a numerical dynamic sanitary sewer and storm water drainage simulation model
    Patent number: 7039565
    Abstract: An hydraulics software system for a one-dimensional hydrodynamic numerical model for modeling unsteady flows in sewer and storm water urban drainage systems is provided. The inventive software uses as a numerical model, an implicit four-point, finite-difference solution technique to solve the one-dimensional Saint-Venant equations. The software is designed to select that numerical model, or equation that best describes, or best exhibits the behavior of each of the various structures and flows encountered in complex hydrodynamic systems such as a sewer and storm water drainage systems. Local partial initial modification for subcritical and supercritical transcritical flows is provided. Relaxation for pipe/channel networks are included for achieving computational performance and robustness for commercial software for practical use in water resource engineering.
    Type: Grant
    Filed: January 3, 2003
    Date of Patent: May 2, 2006
    Assignee: Haestad Methods, Inc.
    Inventors: Ming Jin, Samuel R. Coran, Jack S. Cook, Jr., Danny L. Fread