US6168957B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diagnostic test strip having on-strip calibration
Assignee: LifeScan Inc
•
Filing: 1997-06-25
•
Granted: 2001-01-02
•
Expires: 2017-06-25
Abstract
Abstract A dry phase reagent test strip for measuring the concentration of an analyte in a biological fluid includes a colored indicator whose hue indicates a calibration of the strip. Preferably, the test strip measures the concentration of glucose in whole blood.
Inventors
- 👤 David Matzinger
- 👤 Ian Harding
- 👤 Michael O'Neil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:40
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/521; C; C12; C12Q; C12Q1/00; C12Q1/54; Y; Y10; Y10S; Y10S435/00; Y10S435/805; Y10S435/81; Y10S435/97; Y10S436/00; Y10S436/805; Y10S436/807; Y10S436/81; Y10S436/815
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A diagnostic test strip for measuring an analyte concentration in a sample of biological fluid, comprising (a) a membrane, having a sample side, to which the fluid sample is applied, and a testing side, opposite the sample side; (b) a testing reagent impregnated in the membrane for reacting with the analyte in the sample to cause a detectable color change on the testing side; and (c) a membrane support, attached to the membrane and having on a major surface a colored indicator, whose hue indicates a calibration of the strip.
Claim 2
Dependent Claim
90 words
A diagnostic test strip for measuring an analyte concentration in a sample of biological fluid, comprising (a) a membrane, having a sample side, to which the fluid sample is applied, and a testing side, opposite the sample side; (b) a testing reagent impregnated in the membrane for reacting with the analyte in the sample to cause a detectable color change on the testing side; and (c) a membrane support, attached to the membrane and having on a major surface a colored indicator, whose hue indicates a calibration of the strip.
Claim 3
Dependent Claim
17 words
The strip of claim 1 in which the analyte is glucose and the fluid is whole blood.
Claim 4
Dependent Claim
42 words
The strip of claim 2 in which the reagent comprises (a) a first component for creating hydrogen peroxide from glucose and oxygen and (b) a second component for reacting with the hydrogen peroxide to cause the color change on the testing side.
Claim 5
Dependent Claim
29 words
The strip of claim 1 in which the indicator is colored by a combination of two dyes, and the hue is determined by the relative amounts of the dyes.
References Cited (Backward Citations)
US3907503A
Cited
US4144306A
Cited
US4476149A
Cited
US4592893A
Cited
US4510383A
Cited
US4935346A
Cited
EP0256806A2
Cited
EP0290610A1
Cited
JPS646865A
Cited
US4877580A
Cited
US5281395A
Cited
US5515170A
Cited
US5563031A
Cited
WO1996013707A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-01-02 | 2004-07-03 | 2005-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-02 | 2008-07-03 | 2009-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-02 | 2012-07-03 | 2013-01-02 | $7700.00 | Window Closed / Lapsed |