| Patents for E01F 5 - Draining the sub-base of roads or ballastway of railways by trenches, culverts, or conduits (873) |
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| 01/08/1991 | US4983068 Construction material |
| 09/04/1990 | US4953280 Method of manufacturing prestressed concrete culverts |
| 08/08/1990 | EP0381547A1 Method for laying an entrenched conduit |
| 07/24/1990 | US4942898 Automatic culvert directional flow control device |
| 07/18/1990 | EP0246240B1 Method and apparatus for thawing out road culverts choked with ice |
| 02/27/1990 | US4904113 Highway edgedrain |
| 08/08/1989 | US4854775 Precast concrete culvert system |
| 06/06/1989 | US4836714 Enclosed structures of very large cross-section, such as conduits, silos or shelters |
| 06/06/1989 | CA1255112A1 Rectilinear culvert structure |
| 03/22/1989 | EP0307541A2 Drainage mat |
| 03/15/1989 | EP0307291A1 Bridge abutment for the transverse passage of a ditch |
| 02/22/1989 | EP0303867A2 Edgedrain |
| 02/08/1989 | EP0202256B1 Method of construction for a covered structure |
| 01/10/1989 | US4797030 Precast concrete culvert system |
| 12/21/1988 | EP0296013A1 Tubular construction |
| 12/14/1988 | EP0295175A1 Hollow structure with flat base plate |
| 11/15/1988 | CA1244663A1 Method and apparatus for thawing out road culverts choked with ice |
| 10/11/1988 | CA1242895A1 Precast concrete culvert section |
| 09/13/1988 | US4770211 Method for thawing out road culverts choked with ice |
| 06/14/1988 | CA1237904A1 Drainage mat |
| 04/05/1988 | CA1234766A1 Culvert end guard |
| 02/09/1988 | US4723871 Inexpensive headwall for culverts |
| 02/09/1988 | CA1232461A2 Method for producing hollow structures and hollow structures |
| 01/05/1988 | CA1231063A1 Beaver guard for drainage culvert |
| 12/15/1987 | US4713179 Removable culvert grate |
| 11/25/1987 | EP0246240A1 Method and apparatus for thawing out road culverts choked with ice. |
| 11/11/1987 | EP0244890A2 Process for producing hollow structures such as ducts, silos, or shelters, and structures obtained by this process |
| 11/11/1987 | EP0244651A2 Cell like structure |
| 11/04/1987 | CN87103427A Drainage cell |
| 09/22/1987 | US4695187 Concrete arch buried bridge |
| 08/20/1987 | DE3605329A1 Double-walled seepage-line pipe of plastic |
| 08/18/1987 | US4687371 Precast concrete culvert section |
| 08/11/1987 | US4685829 Modular construction system for a covered structure |
| 06/23/1987 | CA1223128A1 Elongated bendable drainage mat |
| 06/16/1987 | US4673159 Molding forms for making precast portal assembly sections for culverts |
| 05/26/1987 | US4668548 Integrally-anchored fiber-reinforced concrete overlays and surfacings and method of making same |
| 05/05/1987 | US4662782 Culvert beaver block |
| 05/05/1987 | US4662778 Drainage mat |
| 03/19/1987 | DE3617471A1 Preform made of concrete for dewatering structures |
| 03/17/1987 | US4650369 Hydraulic |
| 11/26/1986 | EP0202256A1 Method of construction for a covered structure. |
| 11/05/1986 | EP0200707A2 Installation of highway drainage mat |
| 08/28/1986 | WO1986004939A1 Method and apparatus for thawing out road culverts choked with ice |
| 08/12/1986 | US4605338 Culvert |
| 06/17/1986 | US4595314 Precast concrete culvert section |
| 05/22/1986 | WO1986002967A1 System of modular construction for a covered structure |
| 03/26/1986 | EP0175396A1 Outlet construction having talus protecting properties for tube ducts, in general, and drain ditches, in particular |
| 02/25/1986 | US4572700 Elongated bendable drainage mat |
| 01/14/1986 | US4564313 Rectilinear culvert structure |
| 01/07/1986 | US4563107 In a subsurface culvert structure |
| 12/17/1985 | US4558969 Hinge for use with large pre-cast overfilled load support structures |
| 10/15/1985 | CA1195129A1 Culvert beaver block |
| 08/27/1985 | US4537529 Earth retaining end element for use with overfilled load support structures |
| 07/30/1985 | CA1191033A1 Culvert |
| 06/25/1985 | CA1189332A1 Concrete arch buried bridge |
| 01/02/1985 | CA1180200A Composite arch structure |
| 11/07/1984 | EP0124500A2 Elongated bendable drainage mat |
| 01/03/1984 | CA1159661A1 Containment reservoir and method |
| 10/18/1983 | CA1155309A1 Culvert structure having corrugated ribbing support |
| 09/27/1983 | US4406403 Method of providing a containment reservoir |
| 07/19/1983 | CA1150069A2 Method of collecting liquids in a containment reservoir |
| 06/14/1983 | US4388357 Polyester fabric and rubber layer |
| 03/22/1983 | CA1143170A1 Arch-beam structure |
| 01/11/1983 | CA1139115A1 Open top drain |
| 10/28/1982 | WO1982003644A1 Road culvert |
| 03/09/1982 | US4318635 Culvert structure having corrugated ribbing support |
| 10/27/1981 | US4296884 Containment reservoir and method |
| 09/02/1980 | US4220181 Multi-layer pipe with single corrugation in inner wall |
| 08/26/1980 | US4219513 Method and means of construction of concrete culverts |
| 02/21/1979 | EP0000788A1 Draining ditch headwall unit |
| 05/24/1977 | US4024719 Reinforced road foundation and method for making said road foundation |
| 03/15/1977 | US4011726 Delta culvert |
| 09/21/1976 | US3981153 Body plate serving to secure drain pipes in embankments |