Patent · US Expired

Apparatus for the cryogenic enrichment of trace substances of a gas stream

US4887434A · kind A · utility

1Cited by

7References

9Claims

0Family size

Assignee

Kernforschungsanlage Lulich Gesellschaft mit beschrankter Haftung · DE

Inventors

Gunter Pilwat · Jülich, DE
Jochen Rudolph · Neu Wulmstorf, DE

Key dates

Filing date	Aug 23, 1988
Grant date	Dec 19, 1989
Priority date	—
Expiry date	Aug 23, 2008

Classification

Technology area (CPC G)Physics
CPC primaryG01N30/00
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Samples of trace substances are cryogenically concentrated by passing a gas sample through a U-bend immersed in liquid nitrogen. The U-bend is surrounded by a chamber wall and the chamber is vented so that liquid nitrogen can rise into the chamber when the vent is open but is driven out when the vent is closed and the enrichment pipe is heated to desorb the accumulated trace substances from the adsorbent in the enrichment pipe.

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