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| Number | Title | Issue Date |
| 7140454 | Well drilling bit A well drilling bit having a bit body attachable to a tubular drill string, which bit body is internally provided with a passageway providing fluid communication, when the drill string is attached to the bit body, between the interior of the drill string and the ext... | 11/28/2006 |
| 6739412 | Pile boring tools A boring apparatus is described which comprises a substantially hollow vessel with a fixed base and a rotatable base. The rotatable base is provided, at its circumference, with at least one side cutter which rotatable with the rotatable base from a first position, i... | 05/25/2004 |
| 4323019 | Method and apparatus for planting seedlings A method and apparatus is provided for planting tree seedlings or the like. The apparatus includes an elongate tube, and a pair of blades pivotally mounted to the lower end of the tube. The blades are each pivotal between a closed position closing the low... | 04/06/1982 |
| 4265036 | Bucket dredging and conveying system A method and apparatus for removing bottom material from beneath the surface of a body of water includes a floatable base upon which a tower is mounted for extending vertically upwardly therefrom. A rigid, elongate member having a bucket is connected to t... | 05/05/1981 |
| 4023629 | Toggle actuated underreamer An underreamer includes a housing and a plurality of underreamer doors, each including a toggle mechanism for selectively extending and retracting the doors. Upon activation of the toggle mechanism thereby extending the doors, the doors are pivoted outwar... | 05/17/1977 |
| 3965999 | Drilling grab for pile foundations and well boreholes A drilling grab for pile foundations and well boreholes wherein the drilling grab comprises a grab body supporting circular grab spades which tilt from an open position to a closed position about pivot pins carried by the grab body. A radially projecting ... | 06/29/1976 |
