Patents by Inventor Clive Straughan

Clive Straughan 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).

  • Expansion bolt
    Patent number: 4400122
    Abstract: The invention relates to an expansion bolt of a type having an expansible shell arranged on an elongated stud, with a tapered plug being provided to expand the shell in use. In order to render the bolt more versatile, a spacer is provided between the plug and the expansible shell, the spacer being in the form of finger elements which engage the inner surface of the shell to expand it.
    Type: Grant
    Filed: January 19, 1981
    Date of Patent: August 23, 1983
    Assignee: Coalequip (Proprietary) Limited
    Inventors: Daniel Minnaar, Clive Straughan