Fluid dispenser with shut-off drip protection
US5447254A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1993 |
| Grant date | Sep 5, 1995 |
| Priority date | — |
| Expiry date | Nov 16, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B15/55
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A dispenser which prevents dripping and drooling of liquid material upon shut off of the dispenser, especially during intermittent dispensing operations. The first embodiment includes a nozzle body and nozzle fitting which include liquid flow passageways and together form an air passageway which communicates with a discharge passageway upstream of the discharge end of the nozzle fitting. Exhaust air from the dispenser is directed into the air passageway such that excess liquid material is blown out of the discharge passageway and off of the discharge end of the nozzle fitting immediately upon shut off of the dispenser. A second embodiment incorporates this anti-drip and anti-drool feature directly into the valve and valve stem of the dispenser by providing the air passageway through the valve and valve stem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.