US4529704A
Expired / Lapsed
US
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Device and method for preparation of a control solution for ketone determination.
Assignee: Bayer Corp
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Filing: 1981-11-25
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Granted: 1985-07-16
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Expires: 2001-11-25
Abstract
Abstract A device for preparing a control solution for ketone analysis is disclosed, as well as a method for preparing it. The device comprises a carrier vehicle incorporated with an ester of a beta -ketoalkanoic acid, and a hydrolyzing substance capable of converting the ester to the corresponding beta -ketoalkanoic acid. The ester has the structure <IMAGE> in which R is a lower alkyl group and R' is an aliphatic or cyclic group having 1 to about 7 carbon atoms. The method comprises contacting a predetermined volume of solvent with the device.
Inventors
- 👤 Robert W. Trimmer
- 👤 William I. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:16
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/96; G01N33/64; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/104998; Y10T436/20; Y10T436/200833
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
82 words
A device useful in the preparation of a ketone control solution, said device comprising a carrier matrix incorporated with a predetermined quantity of a composition comprising (a) a β-ketoalkanoic acid ester having the structure ##STR8## in which R is lower alkyl and R' is an aliphatic or cyclic group having 1 to about 7 carbon atoms; and (b) a hydrolyzing substance capable of converting said ester to the corresponding β-ketoalkanoic acid when said ester and substance are placed in a solvent therefor.
Claim 2
Independent Claim
82 words
A device useful in the preparation of a ketone control solution, said device comprising a carrier matrix incorporated with a predetermined quantity of a composition comprising (a) a β-ketoalkanoic acid ester having the structure ##STR8## in which R is lower alkyl and R' is an aliphatic or cyclic group having 1 to about 7 carbon atoms; and (b) a hydrolyzing substance capable of converting said ester to the corresponding β-ketoalkanoic acid when said ester and substance are placed in a solvent therefor.
Claim 3
Dependent Claim
10 words
The device of claim 1 wherein R' is lower alkyl.
Claim 4
Dependent Claim
9 words
The device of claim 1 wherein R' is methyl.
Claim 5
Dependent Claim
15 words
The device of claim 1 wherein said ester is methylacetoacetate, ethylacetoacetate or ethyl 3-keto-4-phenyl butyrate.
Claim 6
Dependent Claim
10 words
The device of claim 1 wherein said ester is methylacetoacetate.
Claim 7
Dependent Claim
11 words
The device of claim 1 wherein said carrier matrix is paper.
Claim 8
Independent Claim
14 words
The device of any of claims 1-5 wherein said hydrolyzing substance is a base.
Claim 9
Dependent Claim
20 words
The device of claim 7 wherein said base is potassium carbonate, sodium carbonate, potassium hydroxide, sodium hydroxide, or mixtures thereof.
Claim 10
Dependent Claim
13 words
The device of claim 7 wherein said base is an alkali metal carbonate.
Claim 11
Independent Claim
57 words
A device useful in the preparation of a ketone control solution, said device comprising a carrier matrix incorporated with (a) a predetermined amount of a (lower alkyl)acetoacetate and (b) an alkaline substance capable of hydrolyzing said (lower alkyl)acetoacetate to form acetoacetic acid; and a support member comprising an elongated plastic strip having said carrier matrix affixed thereto.
Claim 12
Independent Claim
57 words
A device useful in the preparation of a ketone control solution, said device comprising a carrier matrix incorporated with (a) a predetermined amount of a (lower alkyl)acetoacetate and (b) an alkaline substance capable of hydrolyzing said (lower alkyl)acetoacetate to form acetoacetic acid; and a support member comprising an elongated plastic strip having said carrier matrix affixed thereto.
Claim 13
Dependent Claim
14 words
The device of claim 13 wherein said alkaline substance is an alkali metal carbonate.
Claim 14
Dependent Claim
51 words
The device of claim 1 wherein the β-ketoalkanoic acid ester and the hydrolyzing substance are simultaneously present as a compound having the structure ##STR9## in which R is lower alkyl, R' is an aliphatic or cyclic group having 1 to about 7 carbon atoms, and M is an alkali metal ion.
Claim 15
Dependent Claim
10 words
The device of claim 12 wherein R' is lower alkyl.
Claim 16
Dependent Claim
9 words
The device of claim 12 wherein R' is methyl.
Claim 17
Dependent Claim
11 words
The device of claim 12 wherein M is Na + .
Claim 18
Dependent Claim
18 words
The device of claim 12 wherein R and R' are both methyl and M is Na + .
Claim 19
Independent Claim
28 words
A method for preparing a ketone control solution, comprising contacting a predetermined volume of solvent with the device of any of claims 1-5, 10, 11, 13-16 or 12.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |