Pump dispenser
US5000355A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1986 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Jul 30, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D83/765
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A dispenser of the type having an elongated reservoir for storing toothpaste or other fluent material, an outlet nozzle at one end of the reservoir, and a one-way piston at the other end of the reservoir in contact with the fluent material, the one-way piston comprising a body portion having a top surface for contacting material in the reservoir, a flexible annular sealing member for sealingly engaging the inner wall of the reservoir, and one or more air-venting passages for permitting air trapped between the fluent material in the reservoir and the piston to be vented to the atmosphere as the piston is inserted into the dispenser and into contact with the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.