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US4255384A
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US
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Multilayered integral element for the chemical analysis of the blood
Assignee: Fujifilm Holdings Corp
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Filing: 1979-08-14
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Granted: 1981-03-10
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Expires: 1999-08-14
Abstract
Abstract An integral multilayered element for the chemical analysis of the blood comprising a combination of a porous spreading layer, a reagent layer, and a radiation-blocking layer, said radiation-blocking layer being water-permeable and containing at least one elemental metal or an alloy thereof.
Inventors
- 👤 Masao Kitajima
- 👤 Fuminori Arai
- 👤 Asaji Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:50
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
42 words
An integral multilayered element for the chemical analysis of the blood comprising a combination of a porous spreading layer, a reagent layer, and a radiation-blocking layer, said radiation-blocking layer being water-permeable and containing at least one elemental metal or an alloy thereof.
Claim 2
Dependent Claim
42 words
An integral multilayered element for the chemical analysis of the blood comprising a combination of a porous spreading layer, a reagent layer, and a radiation-blocking layer, said radiation-blocking layer being water-permeable and containing at least one elemental metal or an alloy thereof.
Claim 3
Dependent Claim
30 words
The element of claim 1, wherein said metal is selected from the group consisting of platinum, gold, silver, nickel, chromium, aluminum, zinc, tin, and cooper and alloys and mixtures thereof.
Claim 4
Dependent Claim
24 words
The element of claim 1, wherein said element comprises a porous spreading layer, a radiation-blocking layer and a reagent layer laminated in that order.
Claim 5
Dependent Claim
27 words
The element of claim 1, wherein said element comprises a support having laminated thereto in order a reagent layer, a radiation-blocking layer and a porous spreading layer.
Claim 6
Dependent Claim
26 words
The element of claim 1, wherein said element comprises a detecting layer, a radiation-blocking layer, a reagent layer and a porous spreading layer in that order.
Claim 7
Dependent Claim
30 words
The element of claim 1, wherein said element comprises a support having laminated thereto in order a detecting layer, a radiation-blocking layer, a reagent layer, and a porous spreading layer.
Claim 8
Dependent Claim
19 words
The element of claim 1, wherein said radiation-blocking layer is positioned on one surface of said porous spreading layer.
Claim 9
Dependent Claim
32 words
The element of claim 1, which further comprises a water evaporation blocking cover releasably mounted on the surface of the porous spreading layer which is opposite the surface nearest the reagent layer.
Claim 10
Dependent Claim
14 words
The element of claim 1, wherein said radiation-blocking layer is a porous metal film.
Claim 11
Dependent Claim
18 words
The element of claim 9, wherein said porous metal film is about 50 to about 1,000 A thick.
Claim 12
Dependent Claim
30 words
The element of claim 1, which further comprises a waterproof layer in contact with the surface of the porous spreading layer opposite the surface which is nearest the reagent layer.
Claim 13
Dependent Claim
21 words
The element of claim 11, which further comprises a filter layer interposed between said waterproof layer and said porous spreading layer.
Claim 14
Dependent Claim
20 words
The element of claim 1, wherein said radiation-blocking layer is a layer of a metal powder dispersed in a binder.
Claim 15
Dependent Claim
19 words
The element of claim 13, wherein said metal powder has a particle size of about 1 to 20 μm.
Claim 16
Dependent Claim
29 words
The element of claim 13, wherein said metal powder is an aluminum platelet about 1 to 50 μm 2 in area and about 2 μm or less in thickness.
Claim 17
Dependent Claim
21 words
The element of claim 13, wherein the weight ratio of said metal powder to said binder is about 100:1 to 1:100.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |