US4039284A
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US
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Cyanuric acid compound colorimetric indicator and method for use
Assignee: POOL CHEM Inc
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Filing: 1976-08-12
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Granted: 1977-08-02
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Expires: 1996-08-12
Abstract
Abstract A formulation for colorimetric determination of the concentration of cyanuric acid compounds, particularly in swimming pool water, comprises an aqueous solution of a stabilizer, monoethanolamine and a thymolsulfonphthalein compound which, in aqueous solution with monoethanolamine, will exhibit different characteristic color shades dependent upon the concentration of cyanuric acid compounds. The stabilizer is a water-soluble, ultraviolet light absorbing material which is a condensation product of a disulfonic acid derivative with stilbene, stilbyle or their derivatives.
Inventors
- 👤 Thomas P. Mancini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:59
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/182; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/14; Y10T436/145555; Y10T436/147777
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
79 words
A formulation for colorimetric determination of the concentration of cyanuric acid compounds in aqueous solution comprising an aqueous solution of: a. an indicator comprising a thymolsulfonphthalein compound which, in aqueous solution with monoethanolamine, exhibits different characteristic color shades dependent upon the concentration of cyanuric acid compounds present in solution; b. monoethanolamine; and c. a stabilizer which is a condensation product of a disulfonic acid derivative with a compound selected from the class consisting of stilbene, stilbyle and their derivatives.
Claim 2
Dependent Claim
79 words
A formulation for colorimetric determination of the concentration of cyanuric acid compounds in aqueous solution comprising an aqueous solution of: a. an indicator comprising a thymolsulfonphthalein compound which, in aqueous solution with monoethanolamine, exhibits different characteristic color shades dependent upon the concentration of cyanuric acid compounds present in solution; b. monoethanolamine; and c. a stabilizer which is a condensation product of a disulfonic acid derivative with a compound selected from the class consisting of stilbene, stilbyle and their derivatives.
Claim 3
Dependent Claim
11 words
The formulation of claim 1 wherein said indicator further includes phenolphthalein.
Claim 4
Dependent Claim
47 words
The formulation of claim 1 wherein said thymolsulfonphthalein compound is selected from the class consisting of substituted and unsubstituted thymolsulfonphthalein salts and substituted thymolsulfonphthaleins, and said stabilizer is selected from the class consisting of sodium salts of sulfonilino-hydroxyethyl triazin-substituted stilbenes and sodium salts of naphthotriazole substituted stilbyles.
Claim 5
Dependent Claim
28 words
The formulation of claim 3 wherein said thymolsulfonphthalein salts are sodium salts and said substituted thymolsulfonphthaleins have substituents selected from the class consisting of bromine, cresol and xylene.
Claim 6
Dependent Claim
61 words
The formulation of claim 1 wherein the color change indicator is selected from the class consisting of thymolsulfonphthalein sodium salt; 3',3"dibromo-thymolsulfonphthalein sodium salt plus phenolphthalein; 3',3"dibromo-thymolsulfonphthalein; 3',3"dibromo-thymolsulfonphthalein sodium salt; 3', 3"dibromo-2,5-xylenolsulfonphthalein; and meta-cresolsulfonphthalein; and the stabilizer is selected from the class consisting of 4,4'-bis [[4-anilino-6[(2-hydroxyethyl) amino]-s-triazin-2-yl]amino]-2,2'-stilbenedisulfonic acid disodium salt; 4,4'bis(4-3-sulfoanilino)-6-(bis(2-hydroxyethyl)-amino)-1,3,5-triazin-2-yl) amino stilbene 2,2'disulfonic acid, tetrasodium salt; and 2-(stilbyle-4")-(naphtho-1',2:4,5)-1,2,3-triazole 2",6'-sodium disulfonic acid.
Claim 7
Dependent Claim
47 words
The formulation of claim 1 wherein the ingredients other than water are present in the proportions of about 3.5 to 4.5 parts by weight of said indicator, about 9.5 to 10.5 parts by weight of monoethanolamine and about 0.4 to 0.6 parts by weight of said stabilizer.
Claim 8
Dependent Claim
22 words
The formulation of claim 6 wherein said indicator comprises a minor portion of phenolphthalein and a major portion of said thymolsulfonphthalein compound.
Claim 9
Dependent Claim
17 words
The formulation of claim 6 wherein water comprises at least about 99% by weight of the formulation.
Claim 10
Dependent Claim
95 words
A formulation for colorimetric detection of cyanuric acid compounds in swimming pool water and the like comprising an aqueous solution of: a. an indicator which, in aqueous solution with monoethanolamine, exhibits different characteristic color shades dependent upon the concentration of cyanuric acid compounds in the solution and selected from the class consisting of substituted and unsubstituted thymolsulfonphthalein salts and substituted thymolsulfonphthaleins; b. monoethanolamine; and c. a stabilizer which is a water soluble, ultraviolet light absorbent condensation product of a disulfonic acid derivative with a compound selected from the class consisting of stilbene and its derivatives.
Claim 11
Dependent Claim
95 words
A formulation for colorimetric detection of cyanuric acid compounds in swimming pool water and the like comprising an aqueous solution of: a. an indicator which, in aqueous solution with monoethanolamine, exhibits different characteristic color shades dependent upon the concentration of cyanuric acid compounds in the solution and selected from the class consisting of substituted and unsubstituted thymolsulfonphthalein salts and substituted thymolsulfonphthaleins; b. monoethanolamine; and c. a stabilizer which is a water soluble, ultraviolet light absorbent condensation product of a disulfonic acid derivative with a compound selected from the class consisting of stilbene and its derivatives.
Claim 12
Dependent Claim
58 words
The formulation of claim 9 wherein said indicator is selected from the class consisting of thymolsulfonphthalein sodium salt; 3',3"dibromo-thymolsulfonphthalein sodium salt plus phenolphthalein; 3',3"dibromo-thymolsulfonphthalein; 3',3"dibromo-thymolsulfonphthalein sodium salt; 3',3"dibromo-2,5-xylenolsulfonphthalein; and meta-cresolsulfonphthalein; and wherein the stabilizer is selected from the class consisting of 4,4'-bis[[ 4-anilino-6[(2-hydroxyethyl)amino]-s-triazin-2-yl]amino]-2,2'-stilbenedisulfonic acid disodium salt; 4,4'bis(4-3-sulfoanilino)-6-(bis(2-hydroxyethyl)-amino)-1,3,5-triazin-2-yl) amino stilbene 2,2'disulfonic acid, tetrasodium salt; and 2-(stilbyle-)-(naphtho-4"1',2:4,5)-1,2,3-triazole 2",6'-sodium disulfonic acid.
Claim 13
Dependent Claim
103 words
The formulation of claim 9 containing water in an amount to dilute the other ingredients of the formulation so that dropwise addition of the formulation to a sample containing between about 20 to about 200 parts per million by weight cyanuric acid compounds causes the different characteristic color shades to be exhibited in an intensity discernible to the unaided eye, and wherein the other ingredients are present in the following relative proportions: said indicator from about 3.5 to 4.5 parts by weight; said monoethanolamine from about 9.5 to 10.5 parts by weight; and said stabilizer from about 0.4 to 0.6 parts by weight.
Claim 14
Dependent Claim
22 words
The formulation of claim 11 wherein said indicator comprises a minor portion of phenolphthalein and a major portion of the thymolsulfonphthalein compound.
Claim 15
Dependent Claim
47 words
The formulation of claim 12 wherein said other ingredients are present in the following relative proportions: said indicator from about 3.68 to 4.40 parts by weight; said monoethanolamine from about 9.50 to 10.50 parts by weight; and said stabilizer from about 0.48 to 0.52 parts by weight.
Claim 16
Dependent Claim
49 words
The formulation of claim 10 in which said indicator is thymolsulfonphthalein sodium salt and the ingredients other than water are present in the following approximate relative proportions: said indicator about 3.7 parts by weight; said monoethanolamine about 10.0 parts by weight; and said stabilizer about 0.5 parts by weight.
Claim 17
Dependent Claim
51 words
The formulation of claim 10 in which said indicator is phenolphthalein plus 3',3"dibromo-thymolsulfonphthalein sodium salt and the ingredients other than water are present in the following approximate relative proportions: said indicator about 4.4 parts by weight; said monoethanolamine about 10.0 parts by weight; and said stabilizer about 0.5 parts by weight.
Claim 18
Independent Claim
116 words
A method for colorimetric determination of the concentration of cyanuric acid compounds in aqueous solution comprising the steps of: a. obtaining a sample of said solution; b. adding to said sample a formulation comprising an aqueous solution of: 1. a thymolsulfonphthalein compound which, in aqueous solution with monoethanolamine, exhibits characteristic color shades which are dependent upon the concentration of cyanuric acid compound in said aqueous solution; 2. monoethanolamine; and 3. a stabilizer which is a condensation product of disulfonic acid derivatives with a compound selected from the class consisting of stilbene, stilbyle and their derivatives; and c. mixing said sample and said formulation and observing the resultant characteristic color shade of the mixed sample and formulation.
Claim 19
Independent Claim
116 words
A method for colorimetric determination of the concentration of cyanuric acid compounds in aqueous solution comprising the steps of: a. obtaining a sample of said solution; b. adding to said sample a formulation comprising an aqueous solution of: 1. a thymolsulfonphthalein compound which, in aqueous solution with monoethanolamine, exhibits characteristic color shades which are dependent upon the concentration of cyanuric acid compound in said aqueous solution; 2. monoethanolamine; and 3. a stabilizer which is a condensation product of disulfonic acid derivatives with a compound selected from the class consisting of stilbene, stilbyle and their derivatives; and c. mixing said sample and said formulation and observing the resultant characteristic color shade of the mixed sample and formulation.
Claim 20
Dependent Claim
36 words
The method of claim 16 further including the step of comparing the observed characteristic color shade to a color shade standard which relates the characteristic color shades to concentrations of cyanuric acid compounds in aqueous solution.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |