초록 ▼

There is disclosed a filter and a device positioning the filter between an upper and a lower chamber, particularly useful in an immunoassay. The filter and device are improved in that the membrane comprising the filter is overcoated with at least one water-soluble polymer of a type, a molecular weig

There is disclosed a filter and a device positioning the filter between an upper and a lower chamber, particularly useful in an immunoassay. The filter and device are improved in that the membrane comprising the filter is overcoated with at least one water-soluble polymer of a type, a molecular weight, and at a dry-solids coverage effective to create for that membrane an induction time at room temperature of at least about 30 seconds and no greater than about 300 seconds, for a liquid head of pressure of about 6 mm of water.

대표청구항 ▼

In a reaction test device, comprising an upper reaction compartment, a lower fluid collection compartment, and a filter separating the two compartments and comprising a membrane having pores sized to retain selected material and to pass through a solvent, said lower compartment including means for d

In a reaction test device, comprising an upper reaction compartment, a lower fluid collection compartment, and a filter separating the two compartments and comprising a membrane having pores sized to retain selected material and to pass through a solvent, said lower compartment including means for drawing liquid from the upper to the lower compartment through the filter, the improvement wherein said filter further comprises a first water-soluble polymer on and within portions of said membrane, and an additional water-soluble polymer applied on said at least one polymer after the latter is dry, said polymers being of a type, a molecular weight and a dry solids coverage effective to create for said membrane an induction time at room temperature of at least about 30 seconds and no greater than about 300 seconds, for a liquid head of pressure of about 6 mm of water.