Air purge pump dispenser
US5348189A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Feb 26, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B1/3436
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Pump apparatus for delivering water based formulations as an aerosol spray provides for quantities of liquid and air to be pressurized in separate chambers by pump action. Liquid is dispensed through an orifice via a dispensing channel which in one embodiment is purged during a terminal part of the actuating stroke by the release of air through the dispensing channel. In the second embodiment air and liquid are mixed during the actuating stroke so as to be dispensed together and during a return stroke air is sucked through the dispensing channel to remove residual liquid. The air purging action prevents the build-up of deposits in the dispensing channel and orifice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.