Patent · US Expired

Device for detecting gases which must be treated before testing

US4800067A · kind A · utility

4Cited by

2References

4Claims

0Family size

Assignee

DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

Johannes Heckmann · Lübeck, DE
Wolfgang May · Reinfeld, DE

Key dates

Filing date	Jul 2, 1987
Grant date	Jan 24, 1989
Priority date	—
Expiry date	Jul 2, 2007

Classification

Technology area (CPC G)Physics
CPC primaryG01N31/223
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A test tube with several reagent layers affecting the detection reaction, which are separated from one another by means of a permeable interlayer, is improved so that an undesired exchange of reaction products or reagents between the layers is prevented during the measurement process and also during the dwell time, i.e. before and after the measurement. To this end, the interlayer is provided with a valve unit that opens only during the flow.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.