Pop-up sprinkler unit with pressure responsive extendable and retractable seal
US5711486A · kind A · utility
63Cited by
16References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1996 |
| Grant date | Jan 27, 1998 |
| Priority date | — |
| Expiry date | Jan 31, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B3/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pop-up sprinkler unit for mounting beneath the surface of a soil formation includes an outer cylindrical housing for subsurface mounting, with an inner housing carrying a nozzle and drive turbine reciprocally mounted in the outer housing for extending up through a portion of the soil and pressure responsive seals disposed between the inner and outer housings for sealing at predetermined pressures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.