US4631174A
Expired / Lapsed
US
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Multilayer chemical analysis member having an outer waterproof layer
Assignee: Fujifilm Holdings Corp
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Filing: 1985-04-02
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Granted: 1986-12-23
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Expires: 2005-04-02
Abstract
Abstract Chemical analysis sheets comprising a reagent layer, a porous spreading layer and a cover layer provided with a small opening are disclosed. The cover layer prevents rapid evaporation of moisture to ensure a complete reaction between the chemical reagent and the ingredient tested for.
Inventors
- 👤 Asaji Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:36
CPC Classifications
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
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A multilayer chemical analysis member comprising a waterproof layer having a thickness of 8 microns to 1 mm and provided with at least one opening having a size of about 30 microns to about 4 mm in diameter for application of a sample liquid to be tested; a porous spreading layer; a chemical reagent layer comprising a chemical reagent in a hydrophilic or hydrophobic medium, said reagent being capable of reacting with a test material in said sample liquid; and a support layer, all of said layers being bonded together in a unified structure.
Claim 2
Dependent Claim
94 words
A multilayer chemical analysis member comprising a waterproof layer having a thickness of 8 microns to 1 mm and provided with at least one opening having a size of about 30 microns to about 4 mm in diameter for application of a sample liquid to be tested; a porous spreading layer; a chemical reagent layer comprising a chemical reagent in a hydrophilic or hydrophobic medium, said reagent being capable of reacting with a test material in said sample liquid; and a support layer, all of said layers being bonded together in a unified structure.
Claim 3
Dependent Claim
36 words
The multilayered chemical analysis member of claim 1, wherein said porous spreading layer is made of a fibrous material, a non-fibrous material, a micro-porous membrane filter or a polymer film filled with finely divided powder particles.
Claim 4
Dependent Claim
23 words
The multilayered chemical analysis member of claim 1, wherein said opening in said waterproof layer is a polygonal hole or a circular hole.
Claim 5
Dependent Claim
47 words
The multilayered chemical analysis member of claim 1, wherein said at least one opening comprises a plurality of small apertures each with a diameter of about 30 microns to about 0.5 mm and located within a circular area of about 1 mm to 5 mm in diamet.
Claim 6
Dependent Claim
25 words
The multilayered chemical analysis member of claim 1, wherein said waterproof layer is a waterproof film bonded to said porous spreading layer with an adhesive.
Claim 7
Dependent Claim
16 words
The multilayered chemical analysis member of claim 5, wherein said adhesive is a pressure sensitive adhesive.
Claim 8
Dependent Claim
25 words
The multilayered chemical analysis member of claim 1, wherein said waterproof layer is a waterproof adhesive film with an adhesive layer on one surface thereof.
Claim 9
Dependent Claim
20 words
The multilayered chemical analysis member of claim 7, wherein said adhesive layer is a layer of a pressure sensitive adhesive.
Claim 10
Dependent Claim
27 words
The multilayered chemical analysis member of claim 1, wherein said opening in said waterproof layer is an asterisk shaped cut, a cross cut or a linear slit.
References Cited (Backward Citations)
US3554871A
Cited
US4042335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |