| Patents for E02B 11 - Drainage of soil, e.g. for agricultural purposes (2,085) |
|---|
| 08/25/1981 | US4285613 Apparatus for forming and installing underground drainpipe |
| 08/20/1981 | WO1981002317A1 Method of burying wire,tube or cable under ground |
| 08/12/1981 | EP0033570A1 Plastics corrugated pipe |
| 07/28/1981 | US4280534 Plastics pipes having walls with lengthwise extending channels |
| 06/17/1981 | EP0030480A1 Draining, irrigating and dispersing material |
| 06/16/1981 | US4273367 Pipe coupling |
| 06/11/1981 | WO1981001580A1 An arrangement relating to a drainage pipe |
| 06/11/1981 | WO1981001579A1 An arrangement relating to a drainage pipe |
| 06/03/1981 | EP0029816A1 Ditching method and device |
| 06/03/1981 | EP0029713A1 Land drain comprising a drainage conduit covered by a knitted fabric filter sleeve |
| 06/02/1981 | US4270878 Corrugated drainage tubing and method and apparatus for making drainage tubing with helically arranged drainage openings |
| 05/28/1981 | WO1981001433A1 Ditching method and device |
| 04/22/1981 | EP0027150A1 Apparatus for forming and installing underground drainpipe |
| 04/07/1981 | US4260283 De-watering system |
| 03/31/1981 | CA1098327A1 Drain trap |
| 03/24/1981 | CA1098146A1 Pipe coupling |
| 02/11/1981 | EP0023871A1 Material and device for draining, and manufacturing method |
| 02/03/1981 | CA1094830A1 Sub-surface irrigation channel forming vehicles |
| 01/20/1981 | US4246305 Perforated polyethylene strips with internal channels, made by extrusion |
| 01/20/1981 | US4245924 Arch conduit |
| 12/09/1980 | CA1091048A1 Corrugated drainage tubing and method and apparatus for making drainage tubing with helically arranged drainage openings |
| 12/09/1980 | CA1090969A1 Circular extrusion method and apparatus involving rotation around the die axis |
| 12/02/1980 | CA1090594A1 Method of preventing subsoil water contamination |
| 11/25/1980 | US4235561 Subterranean irrigation means and system |
| 11/18/1980 | US4234267 Drain trap |
| 11/11/1980 | CA1089243A1 Apparatus for watering and draining soil |
| 10/28/1980 | CA1088330A1 Subsurface irrigation and drainage system |
| 09/09/1980 | US4221505 Sub-surface irrigation channel |
| 08/05/1980 | US4215727 Plastic well pipe |
| 06/12/1980 | WO1980001196A1 Arched conduit and method of handling same |
| 06/12/1980 | WO1980001180A1 Drain pipe |
| 03/11/1980 | CA1073227A1 Pipe for underdraining |
| 03/11/1980 | CA1073226A1 Underdrainage pipe |
| 02/12/1980 | US4188154 Apparatus for watering and draining soil |
| 01/23/1980 | EP0007045A1 Filter tube |
| 01/22/1980 | US4184831 Apparatus for producing plastic drain pipes |
| 01/15/1980 | US4183696 Underground drainage pipe |
| 01/08/1980 | US4182581 Pipe for underdraining |
| 01/08/1980 | US4182580 Underdrainage pipe |
| 12/25/1979 | US4180464 Method of covering corrugated drainage tubes |
| 12/25/1979 | US4180348 Subsurface irrigation and drainage system |
| 12/12/1979 | EP0005982A2 Machine for filling a pre-cut slot in the ground |
| 10/23/1979 | US4171921 Method for preventing the contamination of subsoil water from products deposited on the ground or in underground cavities |
| 08/07/1979 | US4163619 Corrugated drainage tubing with helically arranged drainage openings |
| 08/07/1979 | CA1059775A1 Corrogated drainpipe and method of manufacturing same |
| 06/19/1979 | US4158534 Apparatus for cutting openings at arbitrarily selectable intervals into pipes |
| 06/13/1979 | EP0002294A1 A plastics well pipe |
| 06/05/1979 | CA1055837A1 Apparatus for cutting openings in a trickle irrigation pipe |
| 02/21/1979 | EP0000788A1 Draining ditch headwall unit |
| 02/20/1979 | US4140422 Plastic corrugated drainage pipe |
| 02/20/1979 | CA1048800A1 Drain digging machine |
| 02/13/1979 | US4139676 Consolidation of aggregate material |
| 02/06/1979 | CA1047780A1 Control for cable plows and the like |
| 01/16/1979 | US4134268 Drainage field pipe |
| 01/09/1979 | CA1045992A1 Plastic pipe having walls with lengthwise extending channels |
| 12/05/1978 | CA1043580A1 Drainage machine with a breaking up tooth |
| 10/10/1978 | US4119157 Control for cable plows and the like |
| 09/26/1978 | US4116286 Probe |
| 09/12/1978 | US4113818 Corrugated plastic |
| 08/29/1978 | US4110420 Method for extruding porous irrigation pipe |
| 08/01/1978 | US4103443 Linkage for an excavating tooth |
| 07/25/1978 | US4102135 Underground drainage pipe |
| 07/04/1978 | US4098089 Method of laying subsoil membranes |
| 06/20/1978 | US4095750 Water conduit |
| 06/13/1978 | US4094466 Irrigation apparatus |
| 05/16/1978 | US4089108 Filter sleeve stuffing machine |
| 04/04/1978 | US4082327 Connecting joint for corrugated plastic tubing |
| 01/03/1978 | US4065925 Underground drainage pipe |
| 11/08/1977 | US4057500 Earth drain |
| 09/06/1977 | US4045964 Subterranean panel drain |
| 08/23/1977 | US4043135 Trench cutter for excavating trenches and for laying water pipes and drainage pipes |
| 05/24/1977 | US4024894 Perforated corrugated tube and method and apparatus for manufacturing the same |
| 05/03/1977 | US4020639 Oval pipe with a flat base |
| 04/26/1977 | US4019326 Nonwoven horizontal drainage system |
| 04/12/1977 | US4016727 Drain trough member and its connector |
| 03/15/1977 | US4011727 Movable cable plow for constructing underwater cable |
| 02/08/1977 | US4006599 Plastic drain pipe and apparatus for producing the same |
| 01/18/1977 | US4003408 Polyethylene binder and elastomer bodies |
| 08/24/1976 | US3976578 Protective sleeve for corrugated drainage tubes |
| 07/13/1976 | US3968654 Underground drain pipe coupling |
| 06/29/1976 | US3965686 Drain sheet material |
| 06/01/1976 | US3959977 Concrete slip forming apparatus |
| 05/25/1976 | US3958425 Corrugated plastic drainage pipe with integral coupler |
| 05/18/1976 | US3957087 Pin and truss cylinder construction |
| 02/03/1976 | US3936380 Means to counteract a clogging of drain pipes |