Chemistry: analytical and immunological testing – Optical result
Reexamination Certificate
2006-11-14
2006-11-14
Warden, Jill (Department: 1743)
Chemistry: analytical and immunological testing
Optical result
C422S082050
Reexamination Certificate
active
07135342
ABSTRACT:
An electro-optical sensing device for detecting the presence and concentration of an analyte in a liquid or gaseous medium includes a pair of indicator elements positioned to receive radiation from a radiation source and transmit radiation to a pair of photosensitive elements. The indicator elements each contain indicator molecules having an optical characteristic responsive to the presence of an analyte; however, one of the indicator elements is covered by an analyte-impermeable chamber that renders the indicator element insensitive to the presence of the analyte in the medium outside the chamber so that it can be used as a reference to cancel environmental and systemic variables that affect both indicator elements. The chamber preferably holds an analyte-containing fluid in contact with the reference indicator element so that the indicator elements operate under nominally identical conditions. The indicator element used to measure the analyte in the external medium is preferably also covered, but in a manner that provides direct contact between the analyte and the indicator element.
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Colvin, Jr. Arthur E.
Lynn Robert W.
Rothwell Figg Ernst & Manbeck
Sensors for Medicine and Science, Inc.
Warden Jill
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