04852802 is referenced by 129 patents and cites 6 patents.

An improved automated irrigation system having localized moisture needs input to the control function. There is a sprinkler head connected to a supply of water under pressure by a pipe having a valve therein. A moisture sensing probe is placed in the soil adjacent the sprinkler head for developing an electrical signal representing the moisture content of the soil surrounding the probe. There is irrigation bypass logic disposed at the probe and operably connected to the valve and the probe for comparing the moisture content of the soil surrounding the probe to pre-established limits and for preventing the valve from supplying water to the sprinkler head when there is sufficient moisture in the soil. A timer controller can be employed to provide operating power to the system only at preferred times for watering. The moisture parameters for watering are adjustable. There is a wirelessly connected version eliminating wires between the probes and the valves. Supplemental valves are employed in branch lines and riser pipes to give more accurate control over localized areas and planting. Preferred power is supplied by a rechargeable battery recharged by a solar panel. There is apparatus for optimally adding fertilizer to the irrigation water as part of the moisture controlled system or on a stand-alone basis.

Title
Smart irrigation sprinklers
Application Number
7/229555
Publication Number
4852802
Application Date
August 8, 1988
Publication Date
August 1, 1989
Inventor
Joseph W Pender
21550 Cleardale St., Newhall, 91321
CA, US
Donald A Streck
832 Country Dr., Ojai, 93023
CA, US
Jerry R Iggulden
21600 Cleardale St., Newhall, 91321
CA, US
Agent
Donald A Streck
Assignee
Donald A Streck
CA, US
Joseph Pender
CA, US
Jerry Iggulden
CA, US
IPC
A01G 25/16
B05B 12/08
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