Dispenser pumps
US7500582B2 · kind B2 · utility
7Cited by
11References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2002 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Jun 29, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/1074
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pump dispenser suitable for dispensing toothpaste in which a pump chamber has a resiliently flexible flap outlet valve leading into a discharge passage leading to a discharge nozzle. The discharge nozzle features a closure valve, in the form of a concave wall with radial slits, which opens only under appreciable forward pressure. When released, the closure valve closes and retracts forcibly, giving a clean cut-off of product and a degree of backflow via the large outlet valve area of the flap valve as it closes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.