Patents by Inventor David P. Ransburg

David P. Ransburg 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).

  • Patent number: 7404415
    Abstract: An intermittent fluid flow controller including a main body that houses an inlet in controlled fluid communication with an outlet, a mechanical timing mechanism including a rotatable member that rotates during an operation of the timing mechanism, and a first valve operated by the rotatable member. The first valve is disposed in the main body such that a rotational movement of the rotatable member actuates the first valve to intermittently permit and restrict a fluid flow between the inlet and the outlet over a pre-selected period of time determined by the operation of the timing mechanism.
    Type: Grant
    Filed: January 19, 2005
    Date of Patent: July 29, 2008
    Assignee: L.R. Nelson Corporation
    Inventors: Scott W. Jacobs, Lawrence P. Heren, John D. Wisslead, David P. Ransburg
  • Patent number: 4646224
    Abstract: A sprinkler system including a controller having a manual data entry device, a processor and a sprinkler controller. Data is entered through the data entry means relating to conditions in each of a number of zones in which sprinkling is to occur with respect to the amount of water needed to be applied to that zone and the soil water infiltration rate. Upon receiving this information, the processor determines for each zone the number of cycles and the length of time in each cycle that water is to be applied not only so that the amount of water applied during each cycle does not exceed the amount of water the soil can absorb during that cycle, but also so that the total amount of water needed by that zone is applied. The processor employs the number of cycles and the length of on time per cycle to organize the cycles for all of the zones, creating an application program.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: February 24, 1987
    Assignee: L. R. Nelson Corporation
    Inventors: David P. Ransburg, Douglas C. Fletcher, Sven E. Wahlstrom