Rain-activated sprinkler shut-off system
US5087886A · kind A · utility
39Cited by
13References
5Claims
0Family size
Inventor
Key dates
| Filing date | Sep 28, 1990 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Sep 28, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/121
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A moisture detecting system employs a body of porous concrete with electrodes embedded therein. The body of concrete is contained within a housing having an opening in the top thereof to admit rain. The body may also have electrical probes therein connected to the electrodes, which probes can be embedded in the ground to detect moisture therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.