| Patents for G01C 13 - Surveying specially adapted to open water, e.g. sea, lake, river or canal (1,002) |
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| 01/16/1992 | DE4021488A1 Electrical arrangement assigning individual height measurement points - uses rotation laser with mast made up of cages with detectors on plates blackened on both sides, esp. for water depth measurement |
| 11/14/1991 | WO1991017456A1 Measuring device provided with device for displaying tide/tidal current data |
| 10/01/1991 | US5052222 Multiple-unit water depth sensor system |
| 08/27/1991 | US5042942 Laser location apparatus for underwater bodies |
| 07/31/1991 | EP0439255A1 Electronic apparatus with depth meter |
| 04/16/1991 | US5007601 Water depth measuring device for a fishing reel |
| 04/16/1991 | US5007285 Low cost drifter |
| 01/29/1991 | US4988885 Ocean surface wave |
| 01/01/1991 | US4981921 Water-dilutable binders, a process for their production and their use |
| 06/12/1990 | US4932248 Method and device for measuring vertical movements in the absence of a fixed reference point |
| 09/19/1989 | US4866985 Bucket wheel assembly for a flow measuring device |
| 09/12/1989 | CA1259391A1 Computerized fishing machine |
| 08/30/1989 | EP0329657A1 Device for studying and measuring sea swell. |
| 08/08/1989 | US4854166 Lightweight wading rod for stream flow measurements |
| 07/19/1989 | EP0324334A1 Water borne binders, process for their preparation and their use |
| 06/20/1989 | US4840062 Fiber optic current meter with plastic bucket wheel |
| 05/30/1989 | US4835716 Compact measuring apparatus capable of measuring two different data with a single pressure sensor |
| 01/03/1989 | US4794803 For amplifying a differential signal |
| 11/08/1988 | US4783772 Wristwatch with pressure sensor |
| 08/02/1988 | USH503 Wave surface characterization |
| 06/28/1988 | US4753117 Method for displaying information to a diver |
| 06/21/1988 | US4752878 Computerized fishing machine |
| 05/11/1988 | DE3637160A1 Method and measuring device for height surveillance of bottom and crest contours in filled-up flow cross-sections |
| 04/14/1988 | DE3634542A1 Method for determining the position of stationary reflection centres |
| 03/24/1988 | WO1988002101A1 Device for studying and measuring sea swell |
| 12/10/1987 | DE3619253A1 Method for acoustically measuring the surface profile of the bottom of a body of water |
| 09/29/1987 | US4697253 Sonar heave compensation system |
| 07/29/1987 | CN86210591U Sea-surface lumeter with interface receiving signals from fixed satellite |
| 06/09/1987 | US4671120 Combined heading and depth sensor |
| 03/17/1987 | CA1219123A1 Float and depth gauge |
| 02/05/1987 | DE3526427A1 Plumbing device for measuring the height of silt or mud |
| 12/30/1986 | EP0207038A1 Towed densimeter system |
| 09/24/1986 | EP0195636A2 Wristwatch with pressure sensor |
| 09/09/1986 | US4611313 Method for acoustically surveying the surface contours of the bottom of a body of water |
| 08/05/1986 | US4604737 Electronic diving apparatus |
| 03/12/1986 | EP0173707A1 Hydrographic survey apparatus |
| 10/22/1985 | US4549177 Precision fathometer interface adaptor |
| 10/02/1985 | EP0156529A1 Hydrographic survey apparatus |
| 09/12/1985 | WO1985004004A1 Hydrographic survey apparatus |
| 06/04/1985 | US4520668 Manometric instrument for underwater diving |
| 05/08/1985 | EP0140258A1 Method of acoustic under water mapping |
| 02/19/1985 | US4499762 Water wave monitor |
| 02/12/1985 | US4498877 Anchoring system for a buoy, specially a measuring buoy |
| 01/22/1985 | US4494407 Depthometer for underwater diving |
| 09/19/1984 | EP0119074A1 A float and depth gauge |
| 08/21/1984 | US4466281 Buoy for measuring wave slopes |
| 12/20/1983 | US4421049 Submerged device, carrying oceanography apparatuses, with automatic depth control |
| 11/15/1983 | CA1157131A1 Method and means for assessing the condition of the sea surface from a distance |
| 10/18/1983 | US4410282 Apparatus for continuous and direct measurement of the sea surface temperature |
| 10/11/1983 | US4408488 Generalized drifting oceanographic sensor |
| 08/09/1983 | US4397584 Trawl resistant sensor mount |
| 11/23/1982 | CA1136255A1 Body motion compensation filter with pitch and roll correction |
| 09/21/1982 | US4351027 Adaptive riser angle position reference system |
| 08/04/1982 | EP0057031A1 Anchoring system for a buoy, specially a measuring buoy |
| 07/28/1982 | EP0056672A1 Buoy for measuring wave slopes |
| 07/27/1982 | CA1128655A1 Method and apparatus for automatically inscribing magnetic marks on a wireline |
| 01/19/1982 | US4311045 Device for measuring sea currents at great depths |
| 01/05/1982 | US4308749 Device for measuring in real time sea currents in deep water |
| 12/22/1981 | CA1114682A1 Submerged device with automatic depth control for oceanographic apparatus |
| 11/18/1981 | EP0040059A2 Apparatus for continuous and direct measurement of the sea surface temperature |
| 07/07/1981 | US4277167 Depth mapping system |
| 05/26/1981 | US4270142 Adaptive slant range compensator for a remote optical mapping system |
| 04/14/1981 | CA1099386A1 Sediment particle transport detector |
| 02/10/1981 | US4249314 Diver operated bottom survey system |
| 01/06/1981 | CA1093179A1 Pressure ridge detection |
| 10/21/1980 | US4228589 Tapemeasure for underwater use |
| 09/16/1980 | US4222266 Body motion compensation filter with pitch and roll correction |
| 09/02/1980 | US4220044 Wave measuring buoy |
| 08/05/1980 | US4215572 Apparatus and method for supporting oceanographic equipment at selected ocean depths |
| 07/01/1980 | CA1080490A1 Method and apparatus for preventing fluid solidification in an aperture |
| 03/04/1980 | US4191049 System for measuring ocean current |
| 02/26/1980 | US4190868 Method and apparatus for automatically inscribing magnetic marks on a wireline |
| 01/29/1980 | CA1070817A1 Apparatus for measuring water depth |
| 01/22/1980 | US4184368 Oceanic wave measurement system |
| 11/27/1979 | US4175432 Apparatus for towing an underwater instrumentation package |
| 07/17/1979 | US4161118 Force direction transducer |
| 06/19/1979 | US4158306 Wave direction measurement and recording |
| 01/23/1979 | US4135394 Wave measuring buoy |
| 11/14/1978 | CA1042228A1 Water depth measuring device |
| 10/31/1978 | US4123160 Method and apparatus for remotely measuring sub-surface water temperatures |
| 10/24/1978 | US4122429 Apparatus for measuring water depth |
| 09/12/1978 | US4114063 Piezoelectric sediment particle transport detector |
| 08/29/1978 | CA1037290A1 Apparatus for measuring the properties of water |
| 08/22/1978 | US4107995 Recorder for decompression data |
| 07/04/1978 | US4098110 Depth gauge |
| 03/07/1978 | US4077257 Depth Gauge |
| 10/11/1977 | US4052899 Depthometer for underwater immersion |
| 08/23/1977 | US4043132 Method and apparatus for preventing fluid solidification in an aperture |
| 01/04/1977 | US4000648 High sensitivity flowmeter |
| 01/04/1977 | US4000646 Wave height measuring device |
| 12/14/1976 | US3996794 Differential depth indicator |
| 12/07/1976 | US3995480 Thermal sensor for measurement of ocean current direction |
| 11/23/1976 | US3992948 Diver information system |
| 10/12/1976 | US3986110 Water depth measuring device |
| 10/05/1976 | US3983750 Fluid level sensing device |
| 08/03/1976 | US3972231 Method for measuring velocity and direction of currents in a body of water |
| 07/27/1976 | US3971251 Dynamically balanced apparatus for water borne instruments |
| 05/11/1976 | US3955412 Water current force measuring apparatus |
| 04/27/1976 | US3952600 Self-equilibrating balance |
| 03/02/1976 | US3940982 Subbottom rock mapping probe |