The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2001
Filed:
Feb. 01, 2000
John Davis, Hucclecote, GB;
Martin John Hofmann, Stroud, GB;
Abstract
An access valve suitable for controlling fluid flow into and out of a chromatography column has a central axially movable probe with a head (,) acting as a spool valve in a barrel (,). Axial movement of the probe adjusts the valve between a fully open condition, in which both a first conduit (,) ending though the probe and a second conduit (,) defined around the probe are open to the column interior, a partly open condition in which a second sealing land (,) on the probe closes the second conduit (,), and a fully closed position in which both conduits are closed. The three options are useful for packing and unpacking chromatography media into and from the column. In the closed condition of the valve, the first and second conduits (,) communicate with one another so that the valve interior can be cleaned while the column is operating.