US4902477A
Expired / Lapsed
US
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Annalytical element for quantitative analysis of bilirubin
Assignee: Fujifilm Holdings Corp
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Filing: 1988-11-17
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Granted: 1990-02-20
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Expires: 2008-11-17
Abstract
Abstract An analytical element for quantitative analysis of bilirubin in a liquid sample by a diazo method, characterized in that the bilirubin detection reagent is a non-diffusive aryldiazonium salt having in the aryl group at least one substituent selected from the group consisting of an alkoxycarbonyl group, an alkylaminosulfonyl group and an alkylaminocarbonyl group.
Inventors
- 👤 Harumi Katsuyama
- 👤 Shigeki Kageyama
- 👤 Kumiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:44
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; G01N33/728; G01N33/52; G01N33/525; G01N33/526; Y; Y10; Y10S; Y10S436/00; Y10S436/903; Y10T; Y10T436/00; Y10T436/14; Y10T436/145555; Y10T436/146666
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
An analytical element for the quantitative analysis of bilirubin in a liquid sample by a diazo method which comprises: a liquid impermeable, light-transmissive support; a porous reagent layer comprising a nondiffusive aryldiazonium salt, the aryl group of which having at least one substituent selected from the group consisting of an alkoxycarbonyl group, an alkylaminosulfonyl group and an alkylaminocarbonyl group, which is contained in a porous matrix comprising solid fine particles and an acidic polymer binder; and a liquid sample-spreading layer.
Claim 2
Dependent Claim
80 words
An analytical element for the quantitative analysis of bilirubin in a liquid sample by a diazo method which comprises: a liquid impermeable, light-transmissive support; a porous reagent layer comprising a nondiffusive aryldiazonium salt, the aryl group of which having at least one substituent selected from the group consisting of an alkoxycarbonyl group, an alkylaminosulfonyl group and an alkylaminocarbonyl group, which is contained in a porous matrix comprising solid fine particles and an acidic polymer binder; and a liquid sample-spreading layer.
Claim 3
Dependent Claim
36 words
The analytical element as claimed in claim 1, in which said aryl group of the aryldiazonium salt further contains at least one substituent selected from the group consisting of an alkyl group and an alkoxy group.
Claim 4
Dependent Claim
34 words
The analytical element as claimed in claim 1 or 2 in which the acidic polymer comprises at least one repeating unit derived from styrene-p-sulfonic acid, acrylic acid, methacrylic acid, or a maleic acid derivative.
Claim 5
Dependent Claim
33 words
The analytical element as claimed in claim 3 in which the acidic polymer is a homopolymer having a repeating unit derived from styrene-p-sulfonic acid, acrylic acid, methacrylic acid, or a maleic acid derivative.
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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) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |