Viscous product dispenser
US4854484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1987 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Jul 27, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/028
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A product dispenser for viscous products is described comprising a tubular container, a liquid pump dispenser, and a take-up piston which advances towards the pump dispenser as product is dispensed therethrough from the container. The take-up piston has a central depression to accommodate the lower portions of the housing of the pump dispenser when the piston reaches its uppermost location when the container is nearly fully evacuated of product. Transverse slots cut downwardly in the upper surface of the piston extend radially outwardly from the central depression to the sides of the piston to provide a means to bleed or vent off unwanted air entrapped in product which lies in the central depression.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.