Process and apparatus for quantitative and/or qualitative analysis of liquids
US4715237A · kind A · utility
4Cited by
13References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1986 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | Feb 12, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F11/021
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The chamber (1) of the metering apparatus is defined by the inside wall surface of a cylinder (3), by a displaceable piston (4), and by a cylinder end portion (5) which is displaceable relative to the cylinder (3). Ducts (2a, 2b) are arranged in the cylinder end portion (5) in such a way that they can be selectively communicated with the chamber (1) or closed off by the end face (7) of the cylinder (3) In that way a part of the chamber wall acts directly as a shut-off member so that no residual volumes remain, which cannot be ejected by the piston (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.