Patent US5019347A successfully refreshed from Google Patents.
US5019347A
Expired / Lapsed
US
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Integral multilayer analytical element
Assignee: Fujifilm Holdings Corp
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Filing: 1990-02-20
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Granted: 1991-05-28
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Expires: 2010-02-20
Abstract
Abstract In an integral multilayer analytical element of a flat sheet type comprising a plurality of layers for quantitative analysis of an analyte in a liquid sample, the improvement which comprises at least two layers of a microporous sheet material arranged adjacent to each other, said at least two layers being combined by an adhesive provided in part on the interface of said layers, whereby the interface allows essentially uniform passage of a liquid therethrough.
Inventors
- 👤 Nobuo Hiratsuka
- 👤 Asaji Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:18
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
An integral multilayer analytical element for quantitative analysis having a first microporous sheet and at least one other microporous sheet on a transparent support, said first microporous sheet and other microporous sheet being arranged adjacent to each other to form an interface, wherein said first microporous sheet and other microporous sheet are combined by an adhesive provided in the form of dots, stripes, or a check pattern at the interface so as to allow uniform passage of a liquid through said interface.
Claim 2
Dependent Claim
82 words
An integral multilayer analytical element for quantitative analysis having a first microporous sheet and at least one other microporous sheet on a transparent support, said first microporous sheet and other microporous sheet being arranged adjacent to each other to form an interface, wherein said first microporous sheet and other microporous sheet are combined by an adhesive provided in the form of dots, stripes, or a check pattern at the interface so as to allow uniform passage of a liquid through said interface.
Claim 3
Dependent Claim
24 words
The intergral multilayer analytical element of claim 1 wherein said other microporous sheet is a microporous light-shielding sheet containing a dye or pigment therein.
Claim 4
Dependent Claim
18 words
The integral multilayer analytical element of claim 1 wherein said other microporous sheet is a microporous reagent sheet.
Claim 5
Dependent Claim
20 words
The integral multilayer analytical element of claim 1 wherein said other microporous sheet is a membrane filter containing a pigment.
Claim 6
Dependent Claim
19 words
The integral multilayer analytical element of claim 1 wherein said adhesive is a liquid adhesive or a heat-sensitive adhesive.
Claim 7
Dependent Claim
32 words
The integral multilayer analytical element of claim 1 wherein the ratio of the area occupied by the adhesive to the surface area of said other microporous sheet is not higher than 50%.
Claim 8
Dependent Claim
32 words
The integral multilayer analytical element of claim 1 wherein the ratio of the area occupied by the adhesive to the surface area of said other microporous sheet is not higher than 20%.
References Cited (Backward Citations)
US127591A
Cited
US3802842A
Cited
US3992158A
Cited
US4089747A
Cited
US4144306A
Cited
US4132528A
Cited
US4292272A
Cited
US4337222A
Cited
EP0066648A1
Cited
US4435362A
Cited
EP0119861A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |