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| Number | Title | Issue Date |
| 8115329 | Water turbine with bi-symmetric airfoil Known underwater turbine units suffer from problems, e.g. an ability to operate in ebb and/or flow tides. Accordingly, the invention provides aerofoil (5), wherein the aerofoil (5) is symmetrical about a mid-chord line (A) thereof. The aerofoil (5 | 02/14/2012 |
| 7944073 | Power generator and turbine unit A power generator includes at least one underwater turbine unit providing a housing having a flow channel therethrough and at least one turbine means mounted in the flow channel for rotation in response to water flow through the flow channel. The turbine unit provid... | 05/17/2011 |
| 7768145 | Power generator and turbine unit A power generator includes at least one underwater turbine unit providing a housing having a flow channel therethrough and at least one turbine means mounted in the flow channel for rotation in response to water flow through the flow channel. The turbine unit provid... | 08/03/2010 |
| 7686075 | Downhole pump assembly and method of recovering well fluids The present invention relates to a downhole tool. In particular, the present invention relates to a downhole pump assembly, a downhole tool assembly including a downhole pump assembly, a well including a downhole pump assembly and to a method of recovering well flui... | 03/30/2010 |
| 7104698 | Thrust bearing for down-hole tool There is disclosed an improved bearing and particularly an improved bearing assembly (15, 15A), eg. a thrust bearing assembly, which may be used in down-hole applications, such as down-hole drilling applications. Thrust bearing assemblies for use in down-hole... | 09/12/2006 |
| 7073610 | Downhole tool A downhole tool for generating a longitudinal mechanical load. In one embodiment, a downhole hammer is disclosed which is activated by applying a load on the hammer and supplying pressurizing fluid to the hammer. The hammer includes a shuttle valve and piston that a... | 07/11/2006 |
| 6527513 | Turbine for down-hole drilling A turbine (4) suitable for use in down-hole drilling and the like, and comprising a tubular casing (11) enclosing a chamber (18) having rotatably mounted therein a rotor (19). The rotor (19) comprises at least one turbine wheel blade arrays (30a) with an ... | 03/04/2003 |
| 6430848 | Underwater excavation apparatus An improved underwater excavation apparatus achieves efficiency and control of movement through provision of a hollow body having at least one inlet and at least one outlet, at least one pair of impellers coaxially displaced one from the other and rotatab... | 08/13/2002 |
| 6178670 | Underwater mining apparatus There is provided an improved apparatus for recovery of sea-bed material. Known apparatus suffer from problems such as low recovery rate and capital cost. The invention, therefore, provides a recovery apparatus comprising a vehicle upon which are mounted ... | 01/30/2001 |
