Two-stage pop-up sprinkler
US4796809A · kind A · utility
47Cited by
7References
9Claims
0Family size
Inventor
Key dates
| Filing date | May 15, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | May 15, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B1/3402
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A two-stage pop-up sprinkler unit includes a cylindrical housing having a first telescoping sleeve reciprocably mounted in the housing and a second sleeve telescoping mounted within the first sleeve and containing the sprinkler head and driving mechanism, the first sleeve extending from the housing first for clearance of the ground surface and the second sleeve extends from the first sleeve with the head cleared to begin distributing water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.