Patents by Inventor Douglas Daniel John Nightingale

Douglas Daniel John Nightingale 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).

  • Plug valves
    Patent number: 3993099
    Abstract: A plug valve having radial ports has a spindle with a plastics sleeve biased by underlying O-rings into sealing contact against the surrounding valve body to subdivide the space between the sleeve and the bore and thereby define at least one discrete passage alignable with selected ports to permit fluid flow therebetween. The valve may be a multiway valve or simply an on/off valve.
    Type: Grant
    Filed: June 6, 1975
    Date of Patent: November 23, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventor: Douglas Daniel John Nightingale
  • Plug valves
    Patent number: 3985155
    Abstract: A plug valve having radial ports has a spindle comprising a mandrel having around it a plastics sleeve with integral upstanding ridges biased against the bore to form seals which subdivide the space between the sleeve and the bore and define the flow passages for alignment with selected ports to permit fluid flow therebetween. The valve may be a multiway valve or simply an on/off valve.
    Type: Grant
    Filed: June 6, 1975
    Date of Patent: October 12, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventor: Douglas Daniel John Nightingale