US5215716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integral multilayer analytical element
Assignee: Fujifilm Holdings Corp
•
Filing: 1991-03-11
•
Granted: 1993-06-01
•
Expires: 2011-03-11
Abstract
Abstract An integral multilayer analytical element comprising a reagent layer containing an indicator reagent composition capable of producing a detectable change corresponding to an analyte and a porous spreading layer composed of a fibrous fabric superposed on the reagent layer, wherein the yarn of said fabric comprises fibers having roughed surface, and an integral multilayer analytical element comprising a water-absorptive layer containing a hydrophilic polymer and a porous spreading layer composed of a fibrous fabric containing an indicator reagent composition capable of producing a detectable change corresponding to an analyte superposed on the water-absorptive layer, wherein the yarn of said fabric comprises fibers having roughed surface. The rouging is carried out, for example, by alkali etching.
Inventors
- 👤 Fuminori Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:00
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
146 words
In an integral multilayer analytical element comprising a reagent layer containing an indicator reagent composition capable of producing a detectable change corresponding to an analyte and a porous spreading layer composed of a fibrous fabric superposed on the reagent layer, the improvement which comprises said fabric being composed of fibers having a roughed surface formed by alkali etching, the fabric having an exposed and unexposed face, the fibers having a roughed surface comprising roughed portions being at least on the exposed face of the fabric, and wherein the depth of the roughness of the roughed surface in the direction perpendicular to the fiber axis is from 0.2 to 0.7 μm, and the roughed portions being further roughed with a fine roughness of a depth from about 50 nm to 200 nm, the density of the roughness of the roughed surface being from about 1 to 200/μm.
Claim 2
Dependent Claim
146 words
In an integral multilayer analytical element comprising a reagent layer containing an indicator reagent composition capable of producing a detectable change corresponding to an analyte and a porous spreading layer composed of a fibrous fabric superposed on the reagent layer, the improvement which comprises said fabric being composed of fibers having a roughed surface formed by alkali etching, the fabric having an exposed and unexposed face, the fibers having a roughed surface comprising roughed portions being at least on the exposed face of the fabric, and wherein the depth of the roughness of the roughed surface in the direction perpendicular to the fiber axis is from 0.2 to 0.7 μm, and the roughed portions being further roughed with a fine roughness of a depth from about 50 nm to 200 nm, the density of the roughness of the roughed surface being from about 1 to 200/μm.
Claim 3
Dependent Claim
25 words
The analytical element of claim 1 wherein said yarn is filament yarn composed of long fibers and said fabric is woven fabric or knitted fabric.
Claim 4
Dependent Claim
21 words
The analytical element of claim 1 wherein said yarn is spun yarn, and said fabric is woven fabric or knitted fabric.
Claim 5
Dependent Claim
22 words
The analytical element of claim 1, claim 2 or claim 3 wherein said reagent layer is provided on a light-transmissive water-impermeable support.
Claim 6
Dependent Claim
25 words
The analytical element of claim 1, claim 2 or claim 3 wherein said reagent layer is provided on a light-reflective or opaque and water-impermeable support.
Claim 7
Dependent Claim
17 words
The analytical element of claim 5, wherein said reagent layer is provided on a light-transmissive water-impermeable support.
Claim 8
Dependent Claim
20 words
The analytical element of claim 5, wherein said reagent layer is provided on a light-reflective or opaque and water-impermeable support.
Claim 9
Dependent Claim
149 words
In an integral multilayer analytical element comprising a water-absorptive layer containing a hydrophilic polymer and a porous spreading layer composed of a fibrous fabric containing an indicator composition capable of producing a detectable change corresponding to an analyte superposed on the water-absorptive layer, the improvement which comprises said fabric being composed of fibers having a roughed surface formed by alkali etching, the fabric having an exposed and unexposed face, the fibers having a roughed surface comprising roughed portions being at least on the exposed face of the fabric, and wherein the depth of the roughness of the roughed surface in the direction perpendicular to the fiber axis is from 0.2 to 0.7 μm, and the roughed portions being further roughed with a fine roughness of a depth from about 50 nm to 200 nm, the density of the roughness of the roughed surface being from about 1 to 200/μm.
Claim 10
Dependent Claim
149 words
In an integral multilayer analytical element comprising a water-absorptive layer containing a hydrophilic polymer and a porous spreading layer composed of a fibrous fabric containing an indicator composition capable of producing a detectable change corresponding to an analyte superposed on the water-absorptive layer, the improvement which comprises said fabric being composed of fibers having a roughed surface formed by alkali etching, the fabric having an exposed and unexposed face, the fibers having a roughed surface comprising roughed portions being at least on the exposed face of the fabric, and wherein the depth of the roughness of the roughed surface in the direction perpendicular to the fiber axis is from 0.2 to 0.7 μm, and the roughed portions being further roughed with a fine roughness of a depth from about 50 nm to 200 nm, the density of the roughness of the roughed surface being from about 1 to 200/μm.
Claim 11
Dependent Claim
25 words
The analytical element of claim 8 wherein said yarn is filament yarn composed of long fibers and said fabric is woven fabric or knitted fabric.
Claim 12
Dependent Claim
21 words
The analytical element of claim 8 wherein said yarn is spun yarn, and said fabric is woven fabric or knitted fabric.
Claim 13
Dependent Claim
20 words
The analytical element of claim 1 or 8 wherein said reagent composition contains a diazonium salt or a tetrazolium salt.
Claim 14
Dependent Claim
23 words
The analytical element of claim 1 or 8 wherein the fibrous fabric is initially hydrophobic and is made hydrophilic by the alkali etching.
References Cited (Backward Citations)
US4292272A
Cited
GB2069132A
Cited
US4783315A
Cited
US4870005A
Cited
US4594224A
Cited
US4478942A
Cited
US4587102A
Cited
US4363874A
Cited
US4451534A
Cited
US4786595A
Cited
EP0114403A1
Cited
US4637978A
Cited
US4547465A
Cited
EP0162302A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |