Test paper and porous membrane
US8187457B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2004 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | May 16, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/255
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A test paper includes a porous membrane capable of separating an object that should be filtered out of a sample by filtration, the porous membrane carrying a reagent capable of reacting with a specified component of the sample to result in coloring. The porous membrane includes a first layer having a surface on which the sample is supplied and a second layer having a surface at which sample percolation and measuring are effected, the first layer composed of large pore portions, the surface of the first layer consisting of a smooth surface having open pore portions, the second layer composed of minute pore portions the surface of the second layer consisting of a surface having open pore portions. The porous membrane has a thickness of 50 to 200 μm and a porosity of 60 to 95%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.