US4671937A
Expired / Lapsed
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Multilayer analytical element
Assignee: Fujifilm Holdings Corp
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Filing: 1984-07-02
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Granted: 1987-06-09
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Expires: 2004-07-02
Abstract
Abstract A multilayer analytical element for analysis of analyte in a liquid sample comprising a liquid sample-spreading layer, a reagent layer containing a diazonium salt, and a liquid-impermeable light-transmissive support, being laminated in this order, in which said reagent layer contains a sulfonic acid group-containing polymer having at least 10 molar % of a repeating unit selected from those consisting of a sulfoalkyl group and sulfophenyl group. The analytical element can be an element comprising a porous reagent layer containing a diazonium salt and the liquid-impermeable light-transmissive support, being laminated in this order.
Inventors
- 👤 Harumi Katsuyama
- 👤 Fuminori Arai
- 👤 Takushi Miyazako
- 👤 Shigeru Nagatomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:08
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/34; C12Q1/40; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; Y; Y10; Y10S; Y10S435/00; Y10S435/805; Y10S436/00; Y10S436/807; Y10S436/81; Y10S436/903; Y10S436/904; Y10S436/91
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
68 words
A multilayer analytical element for analysis of a substance in a liquid sample comprising a liquid sample-spreading layer, a reagent layer containing a diazonium salt, and a liquid-impermeable light-transmissive support, in which said reagent layer contains a polymer containing at least 10 molar % of a repeating unit having a sulfophenyl group, wherein said polymer provides a pH environment which preserves the diazonium salt in the reagent layer.
Claim 2
Dependent Claim
68 words
A multilayer analytical element for analysis of a substance in a liquid sample comprising a liquid sample-spreading layer, a reagent layer containing a diazonium salt, and a liquid-impermeable light-transmissive support, in which said reagent layer contains a polymer containing at least 10 molar % of a repeating unit having a sulfophenyl group, wherein said polymer provides a pH environment which preserves the diazonium salt in the reagent layer.
Claim 3
Dependent Claim
25 words
The analytical element of claim 1 in which said polymer contains not less than 30 molar % of the repeating unit having a sulfophenyl group.
Claim 4
Dependent Claim
23 words
The analytical element of claim 1 in which said polymer is a homopolymer consisting essentially of a repeating unit having a sulfophenyl group.
Claim 5
Dependent Claim
111 words
A multilayer analytical element for the analysis of a substance in a liquid sample comprising a liquid sample-spreading layer, a reagent layer containing a diazonium salt and a liquid-impermeable light-transmissive support, in which said reagent layer contains a polymer containing at least 10 molar % of a repeating unit selected from those consisting of a repeating unit having a sulfoalkyl group and a repeating unit having a sulfophenyl group, and in which a nondiffusive base-containing layer is provided under the condition that the nondiffusive base-containing layer is in liquid contact with said reagent layer, and wherein said polymer provides a pH environment which preserves the diazonium salt in the reagent layer.
Claim 6
Dependent Claim
111 words
A multilayer analytical element for the analysis of a substance in a liquid sample comprising a liquid sample-spreading layer, a reagent layer containing a diazonium salt and a liquid-impermeable light-transmissive support, in which said reagent layer contains a polymer containing at least 10 molar % of a repeating unit selected from those consisting of a repeating unit having a sulfoalkyl group and a repeating unit having a sulfophenyl group, and in which a nondiffusive base-containing layer is provided under the condition that the nondiffusive base-containing layer is in liquid contact with said reagent layer, and wherein said polymer provides a pH environment which preserves the diazonium salt in the reagent layer.
Claim 7
Dependent Claim
18 words
The analytical element of claim 4 in which said nondiffusive base is in the form of a polymer.
Claim 8
Dependent Claim
41 words
The analytical element of claim 4 in which said polymer contains not less than 30 molar % of the repeating unit selected from those consisting of a repeating unit having a sulfoalkyl group and a repeating unit having a sulfophenyl group.
Claim 9
Dependent Claim
39 words
The analytical element of claim 4 in which said polymer is a homopolymer consisting essentially of a repeating unit selected from those consisting of a repeating unit having a sulfoalkyl group and a repeating unit having a sulfophenyl group.
Claim 10
Dependent Claim
68 words
A multilayer analytical element for analysis of a substance in a liquid sample comprising a porous reagent layer containing a diazonium salt and a liquid impermeable light-transmissive support, in which said porous reagent layer contains a polymer containing at least 30 molar % of a repeating unit having a sulfophenyl group, and wherein said polymer provides a pH environment which preserves the diazonium salt in the reagent layer.
Claim 11
Dependent Claim
68 words
A multilayer analytical element for analysis of a substance in a liquid sample comprising a porous reagent layer containing a diazonium salt and a liquid impermeable light-transmissive support, in which said porous reagent layer contains a polymer containing at least 30 molar % of a repeating unit having a sulfophenyl group, and wherein said polymer provides a pH environment which preserves the diazonium salt in the reagent layer.
Claim 12
Dependent Claim
23 words
The analytical element of claim 8 in which said polymer is a homopolymer consisting essentially of a repeating unit having a sulfophenyl group.
Claim 13
Dependent Claim
112 words
A multilayer analytical element for analysis of a substance in a liquid sample comprising a porous reagent layer containing a diazonium salt and a liquid impermeable light-transmissive support, in which which said porous reagent layer contains a polymer containng at leasts 30 molar % of a repeating unit selected from those consisting of a repeating unit having a sulfoalkyl group and a repeating unit having a sulfophenyl group, and in which a nondiffusive base containing layer is provided under the condition that the nondiffusive base-containing layer is in liquid contact with said porous reagent layer, and wherein said polymer provides a pH environment which preserves the diazonium salt in the reagent layer.
Claim 14
Dependent Claim
112 words
A multilayer analytical element for analysis of a substance in a liquid sample comprising a porous reagent layer containing a diazonium salt and a liquid impermeable light-transmissive support, in which which said porous reagent layer contains a polymer containng at leasts 30 molar % of a repeating unit selected from those consisting of a repeating unit having a sulfoalkyl group and a repeating unit having a sulfophenyl group, and in which a nondiffusive base containing layer is provided under the condition that the nondiffusive base-containing layer is in liquid contact with said porous reagent layer, and wherein said polymer provides a pH environment which preserves the diazonium salt in the reagent layer.
Claim 15
Dependent Claim
18 words
The analytical element of claim 10 in which said nondiffusive base is in the form of a polymer.
Claim 16
Dependent Claim
19 words
The analytical element of claim 10 in which the repeating unit is a repeating unit having a sulfophenyl group.
Claim 17
Dependent Claim
39 words
The analytical element of claim 10 in which said polymer is a homopolymer consisting essentially of a repeating unit selected from those consisting of a repeating unit having a sulfoalkyl group and a repeating unit having a sulfophenyl group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |