Patents by Inventor Ray Brown Duggins

Ray Brown Duggins 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).

  • Drip irrigation system
    Patent number: 4086774
    Abstract: A drip irrigation system is disclosed wherein individual drip irrigation tubes are fed from a header by means of a flow controller which feeds water to the irrigation tube at an essentially uniform rate over a wide variety of pressures in the header. Generally the flow controller will be capable of maintaining the flow therethrough within .+-. 15% of a predetermined value within a pressure variation of from 3 to 60 psi.
    Type: Grant
    Filed: February 15, 1977
    Date of Patent: May 2, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ray Brown Duggins
  • Irrigation tubing coupling fastener
    Patent number: 4024716
    Abstract: A fastener for joining a connecting tube and an expansible tube telescoped on the end of the connecting tube. The fastener comprises a compressible ring on the end of the connecting tube and a tubular sheath telescoped on the connecting tube, the expansible tube and the ring. The sheath has an inner surface tapered to a circumference less than the normal circumference of the ring.
    Type: Grant
    Filed: September 16, 1976
    Date of Patent: May 24, 1977
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: Ray Brown Duggins, Peter Garrett Mackauf, David Little Withington