Patents by Inventor David Duncan Craig

David Duncan Craig 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).

  • System for holding down underground storage tanks and method of using
    Patent number: 5848776
    Abstract: A system for holding down underground storage tanks, such as fuel tanks at petrol stations, wherein the tank is tied down to anchors buried with the tank using straps. In order to tension and clamp the ends of the straps a clamping axle is used atop the tank which, when rotated, tightens the strap. The clamping axle is then locked into position and buried with the tank. Apparatus are provided to facilitate tightening of the clamping axle and to lock it into place once the strap reaches an appropriate tension.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: December 15, 1998
    Assignee: Maskell Productions Limited
    Inventors: David Duncan Craig, Donald Andrew Craig