Automatic sprinkler head
US6439315B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 2001 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | May 3, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62C37/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A sprinkler head includes a body having one end adapted for connection to a supply of pressurized fluid and the other end closed by a valve element, and a thermally responsive assembly for normally holding the valve element in a closed position and opening the valve element at a preset temperature to cause the pressurized fluid to flow out of the other end of the body. The thermally responsive assembly includes a holder and a fusible alloy contained within the holder and held in place by a plunger. The fusible alloy is free of lead and/or cadmium and includes at least two materials selected from the group consisting of tin, bismuth, indium, zinc, gallium and silver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.