Patents by Inventor Abraham A. Spiering

Abraham A. Spiering 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).

  • Blast furnace taphole drill
    Patent number: 4456083
    Abstract: A blast furnace taphole drill has a flaring head (3) with cutting edges (5) at its cutting end formed by intersecting angled faces. A central bore (4) carries cleaning air to the cutting end. To prevent blockage of the cleaning air bore (4) by debris and possible jamming of the drill, the head has deep radial grooves (6) formed at the bottoms of the valley shapes between the cutting edges (5). The grooves (6) extend radially from the air bore (4) and conduct the air so that it can get behind or under jammed debris. Reduced taphole drilling times can be achieved.
    Type: Grant
    Filed: May 12, 1981
    Date of Patent: June 26, 1984
    Assignee: Estel Hoogovens B.V.
    Inventors: Jacobus A. Gozeling, Sibbele de Boer, Abraham A. Spiering