Patents by Inventor Anthony J.S. Spearing

Anthony J.S. Spearing 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).

  • Support prop
    Patent number: 5720581
    Abstract: The support prop consists of an outer robe (12) with an open flared mouth (14) into which a plunger (16) projects. A deforming ring (18) in use engages the plunger and is initially located within the flared mouth of the outer tube. A chamber (26) is provided within the prop into which fluid under pressure can be introduced through an inlet (28) to the chamber to locate the prop between two surfaces by displacing the plunger relative to the outer tube. A seal (24) is located within the chamber to prevent the fluid from escaping between the plunger and the bore of the outer tube.
    Type: Grant
    Filed: June 26, 1996
    Date of Patent: February 24, 1998
    Assignee: Dorbyl Limited
    Inventors: Michael S. Bacon, Andrew T. Greenwood, Ivan Terblanche, Allan W. Hillier, Anthony J.S. Spearing