Resources Contact Us Home
Irrigation system

Image Number 2 for United States Patent #4928427.

A hollow, cellulose acetate fiber having a wall permeable to water is formed into a coil of constant dimensions. The coil is placed at the root level of the plants to be irrigated. Where the plants are spaced at intervals (as opposed to being immediately adjacent) a number of coil turns are positioned at the plant location and the coil stretched out between plant locations. In this manner, irrigation is concentrated at the plant and minimized in the intervening distance. Consequently, even though the coil is of constant dimensions and porosity, the quantity of water dispensed can be varied as desired. Similarly the spacing between parallel coils can be varied. This spacing variation is desirable where the pressure of the water varies because of height changes, on a slope for example. The subterraneon watering by coil has an additional beneficial effect because the roots of the plants tend to concentrate within the turns of the coil so as to become anchored thereto. This minimizes errosion of the soil around the plants whether caused by water or wind.

  Recently Added Patents
Liquid crystal panel and liquid crystal display
Utilizing virtually stored media snapshots for rasterizing print jobs
Automatic pill dispenser
Systems and methods for sensing external magnetic fields in implantable medical devices
Unsupervised document clustering using latent semantic density analysis
  Randomly Featured Patents
Inert gas cover system for laser welding
Customized tours using handheld devices
Wall panel bracing rib and wall constructed therewith
Set battery charging condition detecting apparatus
Constant voltage power supply circuit
Multi-stage semiconductor cavity filling process
Blood constituent measuring apparatus
Production apparatus for producing an optical fiber cable
Ingestible polymeric phosphonium salts, composition thereof and method of treating hypercholesterolemia
Method and apparatus for generating a dense depth map using an adaptive joint bilateral filter