Patent ID: 7618829

Claim:
A microtiter plate comprising a plurality of wells of a rigid material selected from the group consisting of glass, polystyrene, polyacryl, polyamide, polyethylene, polypropylene, acrylate butadiene styrene (ABS), polyvinylchloride (PVC), nylon ethylene-vinyl acetate (EVA) polyethylene terephthalate (PET), and combinations thereof, wherein each well is a well of a regular microtiter plate wherein, each well is separated from an adjacent well by a well-dividing wall, wherein the bottom of each well is comprised of a (semi-)permeable membrane filter capable of directly or indirectly binding an analyte, wherein the wells are grouped in one or more clusters, each cluster comprising at least two wells wherein said clusters are separated from adjacent clusters by a cluster dividing wall and wherein at least part of the well dividing wall is lower than the cluster dividing wall or wherein the well dividing wall contains at least one passageway connecting at least two adjacent wells within a cluster, said passageway being at a distance from the bottom of the well and at least partly below the top of the well.