US4275031A
Expired / Lapsed
US
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Agent and process for carrying out colorimetric or photometric determinations
Assignee: Merck Patent GmbH
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Filing: 1979-05-07
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Granted: 1981-06-23
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Expires: 1999-05-07
Abstract
Abstract An agent for use in a colorimetric or photometric determination in aqueous solution comrpises: a molded substrate made of non-absorbent, water-insoluble material; and a coating thereon of a solid or waxy organic polymer which dissolves in water to form an optically clear solution; said polymeric coating having a reagent for the determination embedded therein.
Inventors
- 👤 Wolfgang Fischer
- 👤 Brigitte Wissel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:40
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/528; Y; Y10; Y10S; Y10S435/00; Y10S435/805; Y10S435/81; Y10T; Y10T436/00; Y10T436/10; Y10T436/104998; Y10T436/14; Y10T436/142222; Y10T436/17; Y10T436/173076; Y10T436/19; Y10T436/193333; Y10T436/20; Y10T436/206664
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
142 words
A cuvette for carrying out a colorimetric or photometric determination in aqueous solution consisting essentially of: a first film-shaped substrate made of non-absorbent, water-insoluble, optically clear material; and a coating thereon of a solid or waxy organic polymer which dissolves in water to form an optically clear solution, said polymeric coating having a reagent for the determination embedded therein; wherein the coating on the first substrate is covered by a second film-shaped substrate sealed to the first substrate, said second substrate having a stepped, rectangular cross section thereby forming a hollow space of a thickness of 1-3 mm above said coating, said second substrate being made of non-absorbent, water-insoluble, optically clear material; and said hollow space being open on two sides such that a test solution will flow therethrough and fill the hollow space upon submersion of the cuvette in the solution.
Claim 2
Dependent Claim
142 words
A cuvette for carrying out a colorimetric or photometric determination in aqueous solution consisting essentially of: a first film-shaped substrate made of non-absorbent, water-insoluble, optically clear material; and a coating thereon of a solid or waxy organic polymer which dissolves in water to form an optically clear solution, said polymeric coating having a reagent for the determination embedded therein; wherein the coating on the first substrate is covered by a second film-shaped substrate sealed to the first substrate, said second substrate having a stepped, rectangular cross section thereby forming a hollow space of a thickness of 1-3 mm above said coating, said second substrate being made of non-absorbent, water-insoluble, optically clear material; and said hollow space being open on two sides such that a test solution will flow therethrough and fill the hollow space upon submersion of the cuvette in the solution.
Claim 3
Dependent Claim
25 words
A cuvette of claim 1 coated in two locations with a reagent-containing polymeric coating, each location being covered by one of said second film-shaped substrates.
References Cited (Backward Citations)
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US3701633A
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US3768978A
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US3980436A
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US3937613A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |