US4292272A
Expired / Lapsed
US
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Multilayer analysis sheet for analyzing liquid samples
Assignee: Fujifilm Holdings Corp
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Filing: 1980-06-09
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Granted: 1981-09-29
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Expires: 2000-06-09
Abstract
Abstract A multilayer analysis sheet for analyzing liquid samples is described, comprising, in sequence, a light transmitting hydrophobic support having on one side thereof at least one layer containing at least one reagent in a binder and a liquid sample spreading layer made of fabric, which layers are laminated to form an integral unit together with the support, wherein said fabric has the ability to supply a liquid sample placed on the surface thereof to the reagent-containing layer at a substantially constant volume per unit area, which ability is conferred upon the fabric by rendering it hydrophilic; the multilayer analysis sheet can be economically manufactured without variations in quality, and improves the spreading capability of liquid samples.
Inventors
- 👤 Masao Kitajima
- 👤 Fuminori Arai
- 👤 Asaji Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
95 words
A multilayer analysis sheet for analyzing liquid samples comprising, in sequence, a light transmitting water-impermeable support having on one side thereof at least one layer containing at least one reagent in a binder, and a liquid sample spreading layer made of fabric, said layers being laminated to form an intergral unit together with the support, and wherein said fabric has the ability to supply a liquid sample placed on the surface thereof to said reagent-containing layer at a substantially constant volume per unit area, which ability is conferred upon said fabric by rendering it hydrophilic.
Claim 2
Dependent Claim
95 words
A multilayer analysis sheet for analyzing liquid samples comprising, in sequence, a light transmitting water-impermeable support having on one side thereof at least one layer containing at least one reagent in a binder, and a liquid sample spreading layer made of fabric, said layers being laminated to form an intergral unit together with the support, and wherein said fabric has the ability to supply a liquid sample placed on the surface thereof to said reagent-containing layer at a substantially constant volume per unit area, which ability is conferred upon said fabric by rendering it hydrophilic.
Claim 3
Dependent Claim
32 words
A multilayer analysis sheet as in claim 1, wherein said fabric has the characteristic that the spreading of a 7% cattle albumin aqueous solution on the fabric is 30 seconds or less.
Claim 4
Dependent Claim
29 words
A multilayer analysis sheet as in claim 2, wherein said fabric has the characteristic that the spreading of the 7% cattle albumin aqueous solution is 15 seconds or less.
Claim 5
Dependent Claim
28 words
A multilayer analysis sheet as in claim 2, wherein said fabric has the characteristic that the spreading of 7% cattle albumin aqueous solution is 10 seconds or less.
Claim 6
Dependent Claim
35 words
A multilayer analysis sheet as in claim 1, wherein said fabric is rendered hydrophilic by the steps of washing with water and contacting with an aqueous solution containing from 1 to 5% surface active agent.
Claim 7
Dependent Claim
23 words
A multilayer analysis sheet as in claim 1, wherein said fabric contains from about 0.05 to 10% by weight of a hydrophilic polymer.
Claim 8
Dependent Claim
23 words
A multilayer analysis sheet as in claim 6, wherein the fabric contains from about 0.1 to 5% by weight of the hydrophilic polymer.
Claim 9
Dependent Claim
43 words
A multilayer analysis sheet as in claim 1, 2, 3, or 4, wherein said sheet comprises an analytical function supporting layer containing a water-permeable hydrophilic polymer binder between said sample spreading layer and said layer containing at least one reagent in a binder.
Claim 10
Dependent Claim
23 words
A multilayer analysis sheet as in claim 8, wherein said analytical function supporting layer is a radiation-blocking layer or a light reflecting layer.
Claim 11
Dependent Claim
33 words
A multilayer analysis sheet as in claim 9, wherein said sheet includes a structural auxiliary layer containing a water-permeable hydrophilic polymer binder between said sample spreading layer and said analytical function supporting layer.
Claim 12
Dependent Claim
17 words
A multilayer analysis sheet as in claim 10, wherein said structural auxiliary layer is an adhesive layer.
Claim 13
Dependent Claim
33 words
A multilayer analysis sheet as claimed in claim 1, wherein said binder is a water-permeable hydrophilic polymer binder, and further wherein said liquid sample is a liquid sample containing water as a solvent.
Claim 14
Dependent Claim
35 words
A multilayer analysis sheet as claimed in claim 1, wherein said fabric is formed by weaving warp and weft yarns in a plain weave, wherein the count of said weave ranges between 20 and 120.
Claim 15
Dependent Claim
40 words
A multilayer analysis sheet as claimed in any of claims 1 or 12, wherein said fabric is selected from the group consisting of canequim, broadcloth, kapok, flax, hemp, ramie, silk, viscose rayon, cupro-ammonium rayon, cellulose acetate, vinylon and polyethylene terephthalate.
Claim 16
Dependent Claim
89 words
A multilayer analysis sheet as claimed in any of claims 1, 2, 3 or 4, wherein said sheet is further comprised of an analytical function supporting layer containing a water-permeable hydrophilic polymer binder between said sample spreading layer and said layer containing at least one reagent in a binder, and wherein said analytical function supporting layer is a radiation-blocking layer or a light-reflecting layer; said sheet further comprising a structural auxiliary layer containing a water-permeable hydrophilic polymer binder between said sample spreading layer and said analytical function supporting layer.
Claim 17
Dependent Claim
24 words
A multilayer analysis sheet as claimed in any of claims 1, 2, 3 or 4, wherein said structural auxiliary layer is an adhesive layer.
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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |