Patents by Inventor John B. Parrish

John B. Parrish 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 apparatus for the automated control of canals
    Patent number: 5613803
    Abstract: Method and apparatus for the automated control of canals. The present invention achieves and maintains steady state operation in each pool of a canal despite changing demands. Each pool in the canal is controlled separately by its own pool controller. The present invention teaches that control of a canal depends both on controlling the level of fluid in the canal at key locations. To attain this end, the present invention provides two separate control functions within each pool. First, a pool controller constructed according to the principles of the present invention attains and maintains pool level control indirectly by means of pool volume control, i.e. by controlling the pool volume where the flow is known.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: March 25, 1997
    Inventor: John B. Parrish