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Class Information
Number: 405/39
Name: Hydraulic and earth engineering > Drainage or irrigation > Having regulation of flow through channel
Description: Method or apparatus wherein means are provided to cause or control fluid flow within a flow confining passage.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4678367 |
Riser assembly for a sub-surface irrigation and drainage system |
Jul. 7, 1987 |
| 4621945 |
Head control stand |
Nov. 11, 1986 |
| 4538377 |
Irrigation system |
Sep. 3, 1985 |
| 4370227 |
Vacuum drain facility |
Jan. 25, 1983 |
| 4356087 |
Rodent barrier device |
Oct. 26, 1982 |
| 4333830 |
Vacuum drain system |
Jun. 8, 1982 |
| 4298470 |
Sewage septic system with liquid flow drainage control |
Nov. 3, 1981 |
| 4293237 |
Irrigation and drainage apparatus |
Oct. 6, 1981 |
| 4253952 |
Weed screen and trash eliminator |
Mar. 3, 1981 |
| 4246305 |
Drainage structure and process |
Jan. 20, 1981 |
| 4193711 |
Flow control valve for subsurface irrigation system |
Mar. 18, 1980 |
| 4180348 |
Subsurface irrigation and drainage system |
Dec. 25, 1979 |
| 4153380 |
Soil penetration emitter for drip irrigation systems |
May. 8, 1979 |
| 4153297 |
Ground water control for an in situ oil shale retort |
May. 8, 1979 |
| 4102136 |
Pump system providing selective directional flow across fluid barrier |
Jul. 25, 1978 |
| 4086774 |
Drip irrigation system |
May. 2, 1978 |
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