Chemistry: analytical and immunological testing – Optical result – Including gas absorption in liquid or solid
Reexamination Certificate
2005-09-14
2011-10-25
Alexander, Lyle (Department: 1773)
Chemistry: analytical and immunological testing
Optical result
Including gas absorption in liquid or solid
C436S164000, C422S401000, C422S430000, C422S416000, C422S083000, C422S088000, C250S472100
Reexamination Certificate
active
08043861
ABSTRACT:
An apparatus for detecting exposure to at least one hazardous substance is provided. The apparatus includes a body having a plurality of openings, and an attachment mechanism coupled to the body. Each opening is sized to receive a cassette for detecting the presence or absence of at least one hazardous substance. The cassette can include a colorimetric sensor having a base layer fabricated from a hydrophobic film, a colorimetric coating for covering the hydrophobic film, and at least one hydrophobic membrane for controlling the exposure of the specific substance to the colorimetric coating.
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Alexander Lyle
Armstrong Teasdale LLP
K & M Environmental, Inc.
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