Measuring and testing – Sampler – sample handling – etc. – With constituent separation
Reexamination Certificate
2005-03-29
2005-03-29
Williams, Hezron (Department: 2856)
Measuring and testing
Sampler, sample handling, etc.
With constituent separation
C073S064560, C073S864010, C073S864710, C422S069000, C422S088000, C422S105000
Reexamination Certificate
active
06871556
ABSTRACT:
A porous protective sheath for active extraction media used in solid phase microextraction (SPME). The sheath permits exposure of the media to the environment without the necessity of extending a fragile coated fiber from a protective tube or needle. Subsequently, the sheath can pierce and seal with GC-MS septums, allowing direct injection of samples into inlet ports of analytical equipment. Use of the porous protective sheath, within which the active extraction media is contained, mitigates the problems of: 1) fiber breakage while the fiber is extended during sampling, 2) active media coating loss caused by physical contact of the bare fiber with the sampling environment; and 3) coating slough-off during fiber extension and retraction operations caused by rubbing action between the fiber and protective needle or tube.
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Zhang et al., “Direct Solid Phase Microextraction of Complex Aqueous Samples With Hollow Fibre Membrane Protection”, Jul. 1996, Royal Society of Chemistry, Analytical Communications vol. 33, No. 7, pp 219-221.
Andresen Brian D.
Randich Erik
Rogers David A.
Scott Eddie E.
Tak James S.
The Regents of the University of California
Thompson Alan H.
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