Patents by Inventor David D. Field

David D. Field 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).

  • Recirculating sprayer
    Patent number: 4139156
    Abstract: Spray nozzles are aimed at openings in the side of capture chambers. Fluid is pumped directly from sumps within the capture chambers through the spray nozzles and into the capture chamber openings. Vegetation passing between the nozzles and the capture chambers is sprayed, and any fluid not intercepted by vegetation is returned to the sumps after entering the capture chamber openings. The fluid level in each sump is regulated by a float valve which interrupts a flow of fluid fed by gravity from a supply tank.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: February 13, 1979
    Assignee: Porter Manufacturing Corporation
    Inventors: David D. Field, Bill R. Porter, George D. Porter