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| Patents for E01D 4 - Arch-type bridges (511) |
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| 06/25/1985 | CA1189332A1 Concrete arch buried bridge | | 04/30/1985 | US4513465 Stiffening girder for a stayed cable bridge | | 04/02/1985 | CA1184711A1 Stiffening girder for a stayed cable bridge | | 01/01/1985 | US4490950 Front wall of overfilled arched reinforced concrete underpasses | | 07/10/1984 | US4458457 Overfilled arch out of prefab reinforced concrete shells | | 03/22/1983 | CA1143170A1 Arch-beam structure | | 03/10/1981 | CA1097007A1 Lightweight modular, truss-deck bridge system | | 09/09/1980 | CA1085111A1 Method of constructing reinforced concrete bridges and bridges constructed thereby | | 03/11/1980 | US4192120 Method of constructing reinforced concrete bridges | | 10/17/1978 | US4120065 Lightweight modular, truss-deck bridge system | | 01/17/1978 | US4068442 Integral truss-supported deck |
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