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| Number | Title | Issue Date |
| 4357121 | Flap-gate for bottom discharge control in canals having ice problems Rotating flow control flap-gate in a water canal provides a rotating motion to overcome ice friction without additional ice prevention provisions, to permit water flow in the canal below the ice cover.... | 11/02/1982 |
| 4300858 | Variable dam A variable dam for a water channel having a longitudinal flow axis includes a frame having a bottom member extending across the channel and upright end members. A plurality of approximately planar plates are each connected by a pivot pin at one lower corn... | 11/17/1981 |
| 4253202 | Automatic adjusting wave gutter for swimming pools A wave gutter for swimming pools that automatically positions and maintains a longitudinal edge of the gutter, relative to the waterline, for optimum control of waves and other surface disturbances created by persons in the pool includes a wall member, fa... | 03/03/1981 |
| 4146346 | Apparatus and method for controlling tide waters The salinity intrusion of ocean tidewater into a communicating fresh water river is prevented by laterally restricting the out-flow cross-section of the river with a series of flotation weirs and control weirs so that the surface level of the out-flow cro... | 03/27/1979 |
| 4091624 | Self-regulating fluid control valve Self-regulating tide gates comprise a door pivotally mounted to the end of a conduit connecting two separated bodies of water. The door is held open to permit full reciprocal flow between a protected one of the bodies of water and the other body of water ... | 05/30/1978 |
| 4073147 | Water gate control system The present invention discloses a water gate control system which selects either the automatic mode or forced mode, in the automatic mode the gate being automatically swung depending upon the level of a stream or water-way between the upright or closing p... | 02/14/1978 |
| 4053413 | Apparatus for removing particles from water for sprinklers and the like A fine mesh, cylindrical screen is mounted on a cylindrical support lengthwise of a ditch and rotated about its axis. The screen is over half submerged, such as leaving 30% of its area above the normal water level. The rotating screen, at its downstream e... | 10/11/1977 |
| 4036023 | Flood control system for a dam A flood control system for a dam provides for measuring the actual water level of the dam and for calculating the deviation value between a set reference water level and the actual water level. Proportional-position control over the gate angle is then per... | 07/19/1977 |
| 3935711 | Flap gate A flap gate including a water gate door body of closed shell structure having a substantially rectangular vertical transverse cross-section with its bottom edge in the lengthwise direction being detachably supported on pivotal supports in such manner that... | 02/03/1976 |
