| Patents for E21C 50 - Obtaining minerals from underwater, not otherwise provided for (408) |
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| 06/14/1991 | CA2072119A1 Traction tooth for cutting wheels |
| 11/06/1990 | CA1275912C Deep sea mining process |
| 09/04/1990 | CA1273624A1 Device for submerged drilling of foundations |
| 08/22/1990 | EP0382726A1 Process and device for dredging silt in ports, waterways and the like. |
| 11/07/1989 | US4878711 Method and apparatus for mining of ocean floors |
| 09/26/1989 | CA1260022A1 Mining apparatus and jet pump therefor |
| 02/09/1989 | DE3725022A1 Underwater rope cutting process |
| 02/07/1989 | US4802292 Continuous mining device for crust deposits, etc. and continuous line bucket method with turning movement |
| 02/02/1989 | DE3744695A1 Method for dredging and dressing silt from harbours, waterways etc. |
| 02/02/1989 | DE3724251A1 Verfahren und vorrichtung zum baggern von schlick aus hafen, wasserstrassen oder dergleichen Method and device for dredging of silt from harbor, water roads or the like |
| 01/26/1989 | WO1989000630A1 Process and device for dredging silt in ports, waterways and the like |
| 09/13/1988 | US4770255 Arrangement for underwater drilling of foundations |
| 08/24/1988 | EP0279735A1 Method for sea mining exploitation |
| 05/26/1988 | DE3638998A1 Apparatus for picking up mineral deposits from the sea bed |
| 01/12/1988 | US4718835 Mining apparatus and jet pump therefor |
| 12/10/1987 | DE3623930C1 Drive of an appliance for removing and conveying mineral raw materials from the sea bed |
| 10/21/1987 | EP0242307A1 Device for the under water drilling of foundations |
| 08/11/1987 | US4685742 Equipment for extracting ores from sea beds |
| 08/06/1987 | DE3601461A1 Drive arrangement for extracting and conveying minerals from the sea bed |
| 03/24/1987 | US4652055 Device for collecting manganese nodules on the ocean floor |
| 10/28/1986 | US4619762 Devices for recovering polymetal compounds discharged from a submarine hydrothermal source |
| 10/08/1986 | EP0196764A1 Mining apparatus and jet pump therefor |
| 03/11/1986 | US4575155 Pressure differential mining tool |
| 09/25/1985 | EP0155869A1 Installation for the extraction of minerals from the sea-bed |
| 08/06/1985 | US4533526 Collecting geothermal fluid and concentrating |
| 09/25/1984 | US4473256 Chisel barge with shock absorbing system for mast |
| 05/15/1984 | US4448145 Unmanned submarine vehicle |
| 03/27/1984 | US4438902 Pipe string lift system |
| 11/15/1983 | CA1157056A1 Method and apparatus for the recovery of sediments from the bottom of the sea by a suspended suction pipe |
| 11/08/1983 | CA1156689A1 Submarine device for collecting modules on the seabed and for bringing them to the surface |
| 09/20/1983 | US4405176 Method for hydraulically mining unconsolidated subterranean mineral formations using remote support |
| 08/30/1983 | US4401345 Hydraulic borehole mining system |
| 08/16/1983 | US4398361 Recovery of sediments from the bottom of the sea by suspended suction pipe |
| 08/09/1983 | US4397503 Auriferous gravel interceptor |
| 07/05/1983 | US4391468 Method and apparatus for recovering mineral nodules from the ocean floor |
| 06/07/1983 | US4386473 Recovery of sediments from the bottom of the sea |
| 05/10/1983 | US4382361 Ocean floor dredge system having a pneumohydraulic means suitable for providing tripping and heave compensation modes |
| 03/01/1983 | CA1142187A1 Dredge head with mechanical and pumping action |
| 11/16/1982 | CA1135732A1 Method and apparatus for recovery of sediments from the bottom of the sea |
| 11/09/1982 | US4357764 Submarine vehicle for dredging and raising minerals resting on the sea bed at great depths |
| 08/31/1982 | US4347029 Pipe transfer system |
| 08/31/1982 | CA1130826A1 Dredging vessel |
| 07/20/1982 | US4340970 Power wheel |
| 06/29/1982 | CA1126764A1 Device for collecting solid bodies on an underwater bed |
| 04/06/1982 | US4323216 Balanced support plates |
| 04/06/1982 | CA1121392A1 Auriferous gravel interceptor |
| 03/23/1982 | CA1120503A1 Ocean mining system |
| 01/19/1982 | US4311342 Dredge head with mechanical and pumping action |
| 01/19/1982 | CA1116556A1 Apparatus and process for ordinary and submarine mineral beneficiation |
| 11/03/1981 | US4298229 Radiation-free |
| 11/03/1981 | CA1111869A1 Suction nozzle dredge head |
| 08/18/1981 | CA1107308A1 Pivotable means for decreasing drag effects on a generally cylindrical dredge pipe |
| 07/28/1981 | US4280288 Modular draging unit for collecting solid bodies on an underwater bed |
| 04/07/1981 | CA1098920A1 Dredge head having forward water-deflecting means |
| 12/09/1980 | CA1091259A1 Extracting ores from the sea bottom |
| 11/25/1980 | CA1090201A1 Self propelled, uninhabited deap sea vehicle for use in dredging, loading and surface transportation of polymetallic nodules, arctic fishing and lifting of submerged bodies |
| 11/12/1980 | EP0018891A1 Submarine vehicle for dredging and lifting minerals at a great depth |
| 11/11/1980 | US4232903 Ocean mining system and process |
| 11/11/1980 | CA1089500A1 Method of exploitation of a nodule deposit on a sea floor and a device for carrying out said method |
| 11/04/1980 | US4231172 Floating dredger and treatment plant |
| 11/04/1980 | US4231171 Method and apparatus for mining nodules from beneath the sea |
| 10/07/1980 | US4226035 Apparatus for continuously dredging submarine mineral deposit |
| 08/12/1980 | CA1083613A1 Stabilized hoist rig for deep ocean mining vessel |
| 07/29/1980 | CA1082795A1 Geophysical exploration |
| 07/08/1980 | CA1081157A1 Device for use in the emptying of dredging buckets |
| 05/13/1980 | CA1077531A1 Independent unit for the collection and upward transfer of nodules which rest on an underwater bed |
| 05/06/1980 | US4200999 Pivotable means for decreasing drag effects on a generally cylindrical dredge pipe |
| 04/29/1980 | US4200054 Stabilized hoist rig for deep ocean mining vessel |
| 04/08/1980 | US4196531 Independent unit for the collection and upward transfer of nodules which rest on an underwater bed |
| 04/08/1980 | CA1075283A1 Dredging bucket |
| 04/01/1980 | US4195426 Extracting ores from the sea bottom |
| 01/29/1980 | US4185404 Nodule dredging bucket |
| 01/23/1980 | EP0006867A1 Apparatus and process for ordinary and submarine mineral beneficiation |
| 01/22/1980 | US4184583 Device for use in the emptying of dredging buckets |
| 12/18/1979 | US4178704 Suction nozzle dredge head |
| 10/23/1979 | US4171581 Water flow-deflecting shield for dredge suction nozzle |
| 07/31/1979 | CA1059539A1 Method and means for cavity mining minerals from a subsurface deposit |
| 05/08/1979 | CA1054165A1 Method device for collecting solid components immersed in water |
| 02/20/1979 | US4140346 Cavity mining minerals from subsurface deposit |
| 02/20/1979 | US4140344 Extraction of organic matter from marine sediment |
| 01/25/1979 | WO1979000027A1 Apparatus and process for ordinary and submarine mineral beneficiation |
| 12/05/1978 | US4128229 Hoist apparatus with dual mast structure and compound power transmission system |
| 10/31/1978 | CA1041459A1 Apparatus for washing impurities out of granular material |
| 10/17/1978 | US4120783 Slurrying, centrifuging |
| 10/10/1978 | CA1040224A1 Apparatus for recovering minerals, in particular manganese nodules, from the bottom of the water |
| 10/03/1978 | CA1039760A1 Mobile underwater device for excavating materials on the sea bed |
| 04/25/1978 | US4085973 Ocean floor surficial dredging apparatus |
| 02/28/1978 | US4076313 Underwater recovery apparatus |
| 02/21/1978 | US4075599 Undersea geophysical exploration |
| 10/11/1977 | US4052800 System for gathering solids from the ocean floor and bringing them to the surface |
| 10/04/1977 | US4052299 Apparatus for washing impurities out of granular material |
| 08/16/1977 | US4042279 Apparatus for recovering minerals, in particular manganese nodules, from the bottom of the water |
| 08/09/1977 | US4040667 Apparatus for recovering particulate material from the sea bottom |
| 07/26/1977 | US4037874 Apparatus for underwater retrieval, selection and concentration of material for ocean mining |
| 07/12/1977 | US4035022 Self-propelled pickup device for picking up materials lying on the bottom of the sea |
| 05/03/1977 | US4020573 Method and device for sucking up a solid substance from a stock |
| 12/28/1976 | US3999313 Towed sled for deep-sea particle harvest |
| 12/14/1976 | US3996678 Free-fall grab |
| 11/02/1976 | US3988843 Mining transition chamber |
| 08/17/1976 | US3975054 Undersea mining and separating vehicle having motor-powered water jet |