Dispensing pump with positive shut-off
US5409146A · kind A · utility
52Cited by
4References
21Claims
0Family size
Inventors
Key dates
| Filing date | Jun 3, 1993 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | Jun 3, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7879
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A container-mounted dispensing pump incorporates elastomeric duckbill valves for controlling the flow into and from the pump chamber. A mechanism within the pump employs hinged leaves which cooperate with the pump plunger to effect a pinching and closing one of the duckbill valves when the plunger is disposed in a depressed, shipping position. With the pump plunger held in the shipping position, the closed duckbill valve will preclude leakage of the container contents through the pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.