Lawn sprinkler fertilizer device
US4870991A · kind A · utility
15Cited by
5References
18Claims
0Family size
Inventors
Key dates
| Filing date | Aug 17, 1988 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Aug 17, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86397
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for directing a liquid fertilizer into an irrigation system having a liquid fertilizer flow conduit with the valve of a solenoid valve and the float of a float switch located in series and an electric circuit with the switch of the float switch, solenoid of the solenoid valve and automatic timer device in series. The apparatus directs fertilizer therethrough when electricity is delivered to the switch, solenoid, and automatic timer device when the switch is closed by the float and the timer is conducting electricity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.