Patent · US Expired

Apparatus and method for supercritical fluid extraction

US5250195A · kind A · utility

19Cited by

1References

26Claims

0Family size

Assignee

Isco, Inc. · US

Inventors

Robin R. Winter · Lincoln, US
Daniel G. Jameson · Roca, US
Dale L. Clay · Lincoln, US
Robert W. Allington · Lincoln, US

Key dates

Filing date	Oct 23, 1992
Grant date	Oct 5, 1993
Priority date	—
Expiry date	Oct 23, 2012

Classification

Technology area (CPC G)Physics
CPC primaryG01N2035/0441
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An apparatus for supercritical fluid extraction incorporates a removable extraction cartridge which in operation has insignificant pressure difference between its inside and outside walls. In one embodiment, the extractor includes a fraction collector for extractants, an automatic sample changer and an automatic cartridge transfer mechanism which provide completely automated extractions. To automatically perform extraction, valves for the fluids are automatically opened and closed in synchronism with the insertion and removal of the cartridges. These valves force a hard valve element into a softer valve seat with a valve stem that does not rotate significantly under the control of a rotary motor.

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