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US4356149A
Expired / Lapsed
US
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Multi-layer chemical analytical materials
Assignee: Fujifilm Holdings Corp
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Filing: 1980-07-02
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Granted: 1982-10-26
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Expires: 2000-07-02
Abstract
Abstract A multi-layer chemical analytical material comprising a support, a reagent layer on the support and a spreading layer on the reagent layer wherein the reagent layer is composed of a hydrophilic binder and fine hydrophobic particles dispersed in the hydrophilic binder, said hydrophobic particles containing a reagent capable of directly or indirectly reacting with the component being analyzed to produce a color change.
Inventors
- 👤 Masao Kitajima
- 👤 Fuminori Arai
- 👤 Asaji Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:27
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/58; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; G01N33/526; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
A multi-layer chemical analytical material comprising a light-transmitting and water-impermeable support, a reagent layer on the support and an aqueous liquid sample-spreading layer on the reagent layer, wherein the reagent layer is composed of a hydrophilic binder having hydrophobic fine particles dispersed therein, said particles being water impermeable containing a reagent capable of directly or indirectly reacting with a component to be determined to provide a color change and wherein there is substantially no exposure of the reagent on the surface of said hydrophobic fine particles.
Claim 2
Dependent Claim
86 words
A multi-layer chemical analytical material comprising a light-transmitting and water-impermeable support, a reagent layer on the support and an aqueous liquid sample-spreading layer on the reagent layer, wherein the reagent layer is composed of a hydrophilic binder having hydrophobic fine particles dispersed therein, said particles being water impermeable containing a reagent capable of directly or indirectly reacting with a component to be determined to provide a color change and wherein there is substantially no exposure of the reagent on the surface of said hydrophobic fine particles.
Claim 3
Dependent Claim
24 words
The material as claimed in claim 1 wherein the hydrophilic binder contains a second reagent capable of reacting with the component to be determined.
Claim 4
Dependent Claim
42 words
The material as claimed in claim 1 or 2 wherein said hydrophobic fine particles are oily minute particles prepared by adding a lipophilic binder polymer to an oily matter prepared by dissolving the reagent in an organic solvent substantially incompatible with water.
Claim 5
Dependent Claim
46 words
The material as claimed in claim 1 or 2 wherein said hydrophobic fine particles are oily minute particles prepared by dissolving in an organic solvent substantially incompatible with water, a polymer soluble in an organic solvent, and dissolving or dispersing the reagent in the resulting solution.
Claim 6
Dependent Claim
33 words
The material as claimed in claim 3 wherein said hydrophobic fine particles are microcapsules prepared by encapsulating said oily minute particles with a thin layer of a lipophilic polymer or a hydrophilic polymer.
Claim 7
Dependent Claim
19 words
The material as claimed in claim 1 or 2 wherein said spreading layer is a nonfibrous isotropically porous material.
Claim 8
Dependent Claim
20 words
The material as claimed in claim 1 or 2 wherein said spreading layer is a fabric having been made hydrophilic.
Claim 9
Dependent Claim
23 words
The material claimed in claim 1 or 2 wherein said reagent dispersed in said hydrophobic fine particles is a reagent to detect urea.
Claim 10
Dependent Claim
32 words
The material as claimed in claim 1 or 2 wherein the hydrophilic binder in said reagent layer is selected from the group consisting of water-soluble proteins, vegetable gums, and water-soluble synthetic polymers.
Claim 11
Dependent Claim
22 words
The material as claimed in claim 1 or 2 wherein said reagent layer is about 0.5 μm to about 50 μm thick.
Claim 12
Dependent Claim
26 words
The material as claimed in claim 1 or 2 wherein said hydrophobic fine particles are minute particles prepared by pulverizing a solid polymer containing the reagent.
Claim 13
Dependent Claim
27 words
The material as claimed in claim 11 wherein said hydrophobic fine particles are minute particles with a thin layer of a hydrophilic polymer or a hydrophobic polymer.
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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |