US4059407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable chemical indicators
Assignee: Becton Dickinson and Co
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Filing: 1977-01-12
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Granted: 1977-11-22
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Expires: 1997-01-12
Abstract
Abstract A disposable indicator is disclosed which is useful for the measurement of ketones, proteins including albumin and uric acid in biological fluids. The instrument registers the concentration of substance in a given biological fluid with indicia which are directly readable in a convenient notation system (e.g., digital or other symbolic notation). The indicator comprises an improvement over prior art disposable devices which require a comparison of the viewable indication with a color intensity scale to translate the indicia registered to meaningful numerical values or other symbolic notations. The indicator permits the use of chemical reagent concentrations which are at least an order of magnitude greater than those used in prior art, thereby improving stability and drastically lowering the magnitude of interferences.
Inventors
- 👤 Harry T. Hochstrasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:44
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/528; Y; Y10; Y10S; Y10S435/00; Y10S435/97; Y10T; Y10T436/00; Y10T436/14; Y10T436/145555; Y10T436/146666; Y10T436/147777; Y10T436/148888
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
55 words
An indicator for the measurement of ketones dissolved in biological fluids, which comprises; a support member; and a plurality of indicating reagents for said ketones, each of which is located in a separate zone of said member and at least two of which indicate the presence of a different concentration of said ketones in solution.
Claim 2
Dependent Claim
55 words
An indicator for the measurement of ketones dissolved in biological fluids, which comprises; a support member; and a plurality of indicating reagents for said ketones, each of which is located in a separate zone of said member and at least two of which indicate the presence of a different concentration of said ketones in solution.
Claim 3
Dependent Claim
19 words
The indicator of claim 1 wherein said support member is hydrophobic and said zones are formed of bibulous material.
Claim 4
Dependent Claim
31 words
The indicator of claim 1 wherein said reagents are disposed upon said support member in the shape of numerals corresponding to indicia for the level of substance for which they indicate.
Claim 5
Dependent Claim
55 words
An indicator for the measurement of albumin dissolved in biological fluids, which comprises: a support member; and a plurality of indicating reagents for said albumin, each of which is located in a separate zone of said member and at least two of which indicate the presence of a different concentration of said albumin in solution.
Claim 6
Dependent Claim
55 words
An indicator for the measurement of albumin dissolved in biological fluids, which comprises: a support member; and a plurality of indicating reagents for said albumin, each of which is located in a separate zone of said member and at least two of which indicate the presence of a different concentration of said albumin in solution.
Claim 7
Dependent Claim
19 words
The indicator of claim 4 wherein said support member is hydrophobic and said zones are formed of bibulous material.
Claim 8
Dependent Claim
55 words
An indicator for the measurement of proteins dissolved in biological fluids, which comprises: a support member; and a plurality of indicating reagents for said protein, each of which is located in a separate zone of said member and at least two of which indicate the presence of a different concentration of said protein in solution.
Claim 9
Dependent Claim
55 words
An indicator for the measurement of proteins dissolved in biological fluids, which comprises: a support member; and a plurality of indicating reagents for said protein, each of which is located in a separate zone of said member and at least two of which indicate the presence of a different concentration of said protein in solution.
Claim 10
Dependent Claim
19 words
The indicator of claim 6 wherein said support member is hydrophobic and said zones are formed of bibulous material.
Claim 11
Dependent Claim
58 words
An indicator for the measurement of uric acid dissolved in biological fluids, which comprises; a support member; and a plurality of indicating reagents for said uric acid, each of which is located in a separate zone of said member and at least two of which indicate the presence of a difference concentration of said uric acid in solution.
Claim 12
Dependent Claim
58 words
An indicator for the measurement of uric acid dissolved in biological fluids, which comprises; a support member; and a plurality of indicating reagents for said uric acid, each of which is located in a separate zone of said member and at least two of which indicate the presence of a difference concentration of said uric acid in solution.
Claim 13
Dependent Claim
19 words
The indicator of claim 8 wherein said support member is hydrophobic and said zones are formed of bibulous material.
References Cited (Backward Citations)
US2464155A
Cited
US2799167A
Cited
US3036894A
Cited
US3006735A
Cited
US3050373A
Cited
US3139328A
Cited
US3235337A
Cited
US3350278A
Cited
US3411887A
Cited
US3290228A
Cited
US3453180A
Cited
US3814668A
Cited
US3699003A
Cited
US3667916A
Cited
US3810739A
Cited
US3964871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |