Receptacles – Closures – With condition responsive vent or valve
Patent
1992-01-22
1993-03-16
Moy, Joseph Man-Fu
Receptacles
Closures
With condition responsive vent or valve
220234, 220240, B65D 5116
Patent
active
051937034
ABSTRACT:
A cap for sealing pressure vessels is disclosed. The present invention permits a nominal closure to be formed by hand tightening and a substantially higher force to be applied to a cap by a separate clamp mechanism, thereby forming a pressure seal. In certain preferred embodiments, means for providing a process flow through a hole in the seal and filtering means are also provided as part of the cap assembly. A preferred application of the cap of the present invention is for the sealing of sample vessels used for supercritical fluid extraction of compounds from a solid matrix for subsequent chemical analysis. Methods of supercritical fluid extraction are also disclosed. The present invention thus provides methods and apparatus whereby the placement of a sample into a pressurized system may be automated and monitored to ensure adequate seals have been created and maintained within such pressurized systems.
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Bristow James A.
Murphy Gregory E.
Noronha Anil P. F.
Staats, III Louis T.
Hewlett--Packard Company
Man-Fu Moy Joseph
Schuette Richard F.
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