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| Number | Title | Issue Date |
| 4921599 | Double-rack grating for use in wastewater A double screen or double-rack grate for use in the extra-fine screening of waste waters includes two rows of rods in laterally staggered arrangements with one row positioned behind the other in the direction of flow of waste water to be screened. Each ro... | 05/01/1990 |
| 4902410 | Interceptor for the continuous removal of solid matter from a mixture of solids and liquid An interceptor for the continuous removal of solid matter from a mixture of solids and liquids includes a screening drum rotating while in operation in a given direction of rotation. The mixture is fed to the outer surface of the jacket of the drum, where... | 02/20/1990 |
| 4779719 | Lifting device with a higher speed in the downward movement area than in the upward movement area Lifting device with a higher speed in the downward movement area than in the upward movement area, equipped with a driving motor with brake, a gear and a load pick-up system, which runs on an oval or circular or loop-shaped race via a lower and an upper r... | 10/25/1988 |
| 4593648 | Electric fish-repelling device An electric fish-scaring device for water inlet and extraction structures contains several main and counter-electrodes below the surface of the water and which are connected to a voltage supply unit. To monitor operation, at least one simulator electrode ... | 06/10/1986 |
| 4580525 | Electrical fish chasing device An electric fish-scaring device for water inlet and discharge plants includes electrodes positioned below the surface of the water and connected to a voltage supply unit. To enable the device to operate effectively in scaring away fish of different respec... | 04/08/1986 |
