Apparatus for analyzing liquid samples automatically and continually

US6458325B1 · kind B1 · utility

Assignee

• ABB AG · US

Inventors

• Dietrich Roscher · Ilmenau, DE
• Peter Heun · Erfurt, DE
• Holger Klingner · Erfurt, DE
• Norbert Gebert · Schwansee, DE

Key dates

• Filing date: Nov 21, 1997
• Grant date: Oct 1, 2002
• Expiry date: Nov 21, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T436/2575
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An apparatus analyzes liquid samples automatically and continuously by mixing certain reagents within a common arrangement of membrane pumps, mixing chambers and connecting conduits formed in a silicon wafer and evaluating the reaction results with the help of suitable sensors on the silicon wafer, the silicon wafer being of 100 orientation and the structure thereof having been formed by anisotropic etching. Immediately before and after the pump chamber of trapezoidal cross section, there are conduits of a v-shaped or trapezoidal cross section which have a nonlinear flow resistance.