US4097240A
Expired / Lapsed
US
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Process for the production of a diagnostic agent for the detection of ketones
Assignee: Honeywell Riedel de Haen AG
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Filing: 1977-02-09
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Granted: 1978-06-27
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Expires: 1997-02-09
Abstract
Abstract In the process for the production of a diagnostic agent for the detection of ketones, consisting of an absorbent carrier impregnated in a first stage with an aqueous solution of an amino acid and tetrasodium ethylenediamine tetraacetate as buffer, dried and impregnated in a second stage with a solution of sodium nitroferricyanide in a solvent mixture one component of which is methanol and dried again, the improvement which comprises using as the second component of the solvent mixture, instead of dimethyl formamide, which is considered detrimental to health, quite a number of other solvents.
Inventors
- 👤 Wolfgang Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:22
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/64; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/200833
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
In a process for the production of a diagnostic agent for the detection of ketones, consisting of an absorbent carrier impregnated with sodium nitroferricyanide, an alkaline buffer substance and a water-soluble lower amino acid by impregnating the carrier in the first stage with an aqueous solution of the amino acid and tetrasodium ethylenediamine tetraacetate as buffer, drying the carrier, impregnating it in a second stage with a solution of sodium nitroferricyanide in a solvent mixture containing methanol as one component, and drying the carrier again, the improvement which comprises using a solvent mixture consisting of methanol and an organic solvent miscible with methanol which is not dimethyl formamide.
Claim 2
Dependent Claim
108 words
In a process for the production of a diagnostic agent for the detection of ketones, consisting of an absorbent carrier impregnated with sodium nitroferricyanide, an alkaline buffer substance and a water-soluble lower amino acid by impregnating the carrier in the first stage with an aqueous solution of the amino acid and tetrasodium ethylenediamine tetraacetate as buffer, drying the carrier, impregnating it in a second stage with a solution of sodium nitroferricyanide in a solvent mixture containing methanol as one component, and drying the carrier again, the improvement which comprises using a solvent mixture consisting of methanol and an organic solvent miscible with methanol which is not dimethyl formamide.
Claim 3
Dependent Claim
23 words
The process of claim 1, wherein the solvent miscible with methanol is a linear or branched aliphatic alcohol with 2 to 6 C-atoms.
Claim 4
Dependent Claim
10 words
The process of claim 2, wherein the alcohol is propanol.
Claim 5
Dependent Claim
29 words
The process of claim 3, wherein the solvent mixture contains from 10 to 90 parts by volume of methanol and from 90 to 10 parts by volume of propanol.
Claim 6
Dependent Claim
23 words
The process of claim 4, wherein the solvent mixture contains 50 parts by volume of methanol and 50 parts by volume of propanol.
Claim 7
Dependent Claim
123 words
In a process for the production of a diagnostic agent for the detection of ketones, consisting of an absorbent carrier impregnated with sodium nitroferricyanide, an alkaline buffer substance and a water-soluble lower amino acid by impregnating the carrier in the first stage with an aqueous solution of the amino acid and tetrasodium ethylenediamine tetraacetate as buffer, drying the carrier, impregnating it in a second stage with a solution of sodium nitroferricyanide in a solvent mixture containing methanol as one component, and again drying the carrier, the improvement which comprises using a solvent mixture consisting of 10 to 90 parts by volume of methanol and 90 to 10 parts by volume of a linear or branched aliphatic alcohol having 2 to 6 carbon atoms.
Claim 8
Dependent Claim
123 words
In a process for the production of a diagnostic agent for the detection of ketones, consisting of an absorbent carrier impregnated with sodium nitroferricyanide, an alkaline buffer substance and a water-soluble lower amino acid by impregnating the carrier in the first stage with an aqueous solution of the amino acid and tetrasodium ethylenediamine tetraacetate as buffer, drying the carrier, impregnating it in a second stage with a solution of sodium nitroferricyanide in a solvent mixture containing methanol as one component, and again drying the carrier, the improvement which comprises using a solvent mixture consisting of 10 to 90 parts by volume of methanol and 90 to 10 parts by volume of a linear or branched aliphatic alcohol having 2 to 6 carbon atoms.
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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |