Metered aerosol dispenser and method of using the dispenser
US4506803A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1982 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Aug 9, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F11/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An aerosol dispenser dispenses the contents of a metering chamber by depression of a slidable stem which extends through the metering chamber and into the main fluid reservoir of the dispenser. The stem includes a dispensing passage which lies within one of a pair of chamber sealing sleeves when the stem is in a rest position, thus fluidically isolating the exterior of the apparatus from the metering chamber. In this position, the metering chamber and the main reservoir are also fluidically isolated from each other. After shaking the dispenser to mix its contents, i.e., an active agent and propellant, the stem is then depressed into a charging position in which the dispensing passage is placed into engagement with an additional sealing sleeve mounted within the metering chamber to fluidically isolate the metering chamber from the exterior of the dispenser. Simultaneously, the bypass passage is positioned to straddle the other chamber sealing sleeve, and to thus fluidically connect the main reservoir to the metering chamber, which is then charged with the active agent and propellant from the reservoir. The stem is then released, and a spring drives the stem towards its first rest po…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.