Patent ID: 8153444

Claim:
A chromatographic specific binding assay strip device, comprising: a) a non-permeable platform strip; b) a permeable membrane testing strip positioned on top of the non-permeable platform strip wherein said permeable membrane strip is shorter at both ends of said non-permeable platform strip said permeable membrane testing strip comprising a capture reagent site having a capture reagent specific for an analyte being tested; c) a conjugate pad positioned on top of said non-permeable platform, said conjugate pad comprising a permeable membrane containing a conjugate; said conjugate pad being positioned upstream from said permeable membrane testing strip, said conjugate pad being distinct and not in contact with said permeable test strip; d) a semi-permeable membrane positioned on top of and in contact with the conjugate pad and having a distal end that overlaps onto a proximal end of the permeable membrane strip; and; e) a sample receiving pad positioned on top of a proximal end of said semi-permeable membrane.