Patents by Inventor John A. Coetzee

John A. Coetzee 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).

  • Anchoring method and capsule therefor
    Patent number: 4842063
    Abstract: Loose particulate material A, preferably housed in a capsule C, is urged towards the blind end of a borehole H. An anchor element 1 having an end plate 3 or a head and a disc spaced from the head is driven into the hole with rotation to compact the particulate material to form a load bearing annulus. The material is selected to be of a defined aggregate crushing value.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: June 27, 1989
    Inventors: John A. Coetzee, Ernest E. Cranko, Roger K. Moore