Patents by Inventor Andrew Robert Dobson

Andrew Robert Dobson 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).

  • Bladder pump for borehole sampling
    Publication number: 20040184938
    Abstract: The bladder, of flimsy ptfe tubing, is attached to the stem of an end-fitting. The stem is formed with a helical screw-thread form. The tubing is heat-shrunk down over the stem. Then, a helical coil spring is screwed onto the form, whereby the thickness of the ptfe tubing lies trapped and squeezed between the stem and the spring. This manner of attaching the bladder to the stem is mechanically adequate even when the bladder tubing is of small diameter.
    Type: Application
    Filed: January 28, 2004
    Publication date: September 23, 2004
    Inventors: Jamieson Edward Champ, Andrew Robert Dobson, Bruce Randal Blackburn, Douglas James Belshaw