Apparatus for contamination-free transfer of a series of liquid samples in precisely measured volume
US3990312A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1975 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Sep 30, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01L3/0206
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A valve ahead of a continuously running exhaust pump allows air to be sucked through the piping of a burette from the intake capillary and, after the capillary is lowered into the input sample vessel, a quantity of the sample liquid flushes out any remaining traces of a previous sample. After the necessary small quantity of the sample liquid has been thus pulled into and out of the burette, the valve is closed and a piston with a conical head fitting right into the burette draws in a measured quantity of the sample from the input container and then discharges it into the output container. The vertex of the piston is flattened so that the channel through the burette head will not be closed off when the piston is driven all the way into the burette head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.