Fixed-volume liquid dispenser
US8136701B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 2008 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Oct 17, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/1015
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A dispenser for viscous liquids effectuates sequential operations by hydrostatic pressure on an assembly of two pistons separated from each other in a cylinder by a separation spring. When the piston assembly is embedded in material to be dispensed, the space between the pistons fills with material to be dispensed. Pressuring the reservoir by squeezing it or by the addition of pressurized gas, forces the piston assembly down the cylinder at the end of which is an opening from which material in the piston assembly can escape. One of the pistons moves toward the other end by pressure from the reservoir, causing material in the piston assembly to be dispensed. The volume inside the piston assembly defines and limits the volume of material that can be dispensed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.