Chemistry: analytical and immunological testing – Involving diffusion or migration of antigen or antibody
Reexamination Certificate
2005-01-18
2005-01-18
Chin, Christopher L. (Department: 1641)
Chemistry: analytical and immunological testing
Involving diffusion or migration of antigen or antibody
C422S051000, C422S051000, C422S051000, C422S051000, C422S067000, C435S007100, C435S287100, C435S287200, C435S287700, C435S287900, C435S805000, C435S810000, C435S970000, C435S973000, C436S169000, C436S518000, C436S530000, C436S535000, C436S805000, C436S810000, C436S815000
Reexamination Certificate
active
06844200
ABSTRACT:
Disclosed is an improvement to a dry assay device for determining the concentration of a first analyte in a sample of body fluid and a second analyte in the same sample of body fluid. The device involves the use of a strip of an absorbent material through which the sample of body fluid flows and wherein the first analyte is determined colorimetrically in a first region of the strip and the second analyte is determined by an immunoassay which takes place in a second region of the strip located downstream from the first region. The improvement involves placing the strip in a hollow casing having a top and a bottom and which is so constructed that when the top and bottom of the casing are mated there is formed a U shaped, body fluid impervious barrier around the first region of the strip to prevent the sample of body fluid from flowing in any direction other than in the direction of the second region of the strip.
REFERENCES:
patent: 4703017 (1987-10-01), Campbell et al.
patent: 5739041 (1998-04-01), Nazareth et al.
patent: 0462376 (1991-12-01), None
patent: 0291194 (1994-02-01), None
patent: WO 9638720 (1996-12-01), None
Bayer Corporation
Chin Christopher L.
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