US5523054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test element for quantitative NIR spectroscopic analysis
Assignee: Clinical Diagnostic Systems Inc
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Filing: 1995-01-31
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Granted: 1996-06-04
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Expires: 2015-01-31
Abstract
Abstract There is disclosed a slide test element and method of assay that allows for detection of analytes in biological liquids without the use of any detection reagents. The method uses NIR spectroscopy and a test element comprising a support, and a substantially constant light-path defining layer comprising a diffusely-reflecting material that is a) sufficiently porous in all directions as to allow a liquid to spread uniformly in all directions, and b) homogeneously reflects at least 95% of NIR radiation.
Inventors
- 👤 Steven C. Switalski
- 👤 Thomas R. Kissel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:16
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/508; G; G01; G01N; G01N21/00; G01N21/84; G01N21/8483; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; G01N35/00; G01N35/02; G01N35/04; G01N35/10; G01N35/1002; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/359
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A test element for analyzing analytes in patient samples, comprising, in overlying relation, a support, and a substantially constant light-path providing layer consisting essentially of a diffusely-reflecting material that a) is sufficiently porous in all directions as to allow a liquid to spread uniformly in all directions, and b) homogeneously and diffusively reflects at least 95% of NIR radiation, said element being substantially free of: i) reagents capable of reacting with said analyte, and ii) a hydrophilic polymer layer that is both separate from said light-path providing layer, and has a thickness equal to or greater than 1 micron, and further including a mirror layer in-between said light-path providing layer and said support and in contact with said support, effective to increase the path length of NIR radiation through said layer.
Claim 2
Dependent Claim
131 words
A test element for analyzing analytes in patient samples, comprising, in overlying relation, a support, and a substantially constant light-path providing layer consisting essentially of a diffusely-reflecting material that a) is sufficiently porous in all directions as to allow a liquid to spread uniformly in all directions, and b) homogeneously and diffusively reflects at least 95% of NIR radiation, said element being substantially free of: i) reagents capable of reacting with said analyte, and ii) a hydrophilic polymer layer that is both separate from said light-path providing layer, and has a thickness equal to or greater than 1 micron, and further including a mirror layer in-between said light-path providing layer and said support and in contact with said support, effective to increase the path length of NIR radiation through said layer.
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) | 1999-06-04 | 1999-12-04 | 2000-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-04 | 2003-12-04 | 2004-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-04 | 2007-12-04 | 2008-06-04 | $7700.00 | Window Closed / Lapsed |