US3937613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the determination of chlorine in the water of swimming pools
Assignee: Alpha Chemicals Australia Pty Ltd
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Filing: 1975-04-04
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Granted: 1976-02-10
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Expires: 1995-04-04
Abstract
Abstract Para-ethyl-oxyethylamino-aniline or one of its salts is employed as a reagent for testing the presence of chlorine in the water of swimming pools. The reagent dissolved or dispersed in a polypropylene-glycol ethoxylate is coated on to a support. When the coated support is stirred into the water a pink color develops in the water if chlorine is present and the intensity of the color can be used to gauge quantitatively the amount of chlorine present.
Inventors
- 👤 Jan Rosicky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:13
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N33/00; G01N33/18; G01N33/182; Y; Y10; Y10T; Y10T436/00; Y10T436/19; Y10T436/193333
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
A device for the determination of chlorine in the water of swimming pools comprising a substrate suitably shaped for immersion into a sample of the water to be tested carrying on at least a portion of its surface a layer of a composition comprising an active reagent, selected from the group consisting of para-ethyl-oxyethylamino-aniline and the salts thereof, dissolved or dispersed in a polypropylene-glycol ethoxylate.
Claim 2
Independent Claim
65 words
A device for the determination of chlorine in the water of swimming pools comprising a substrate suitably shaped for immersion into a sample of the water to be tested carrying on at least a portion of its surface a layer of a composition comprising an active reagent, selected from the group consisting of para-ethyl-oxyethylamino-aniline and the salts thereof, dissolved or dispersed in a polypropylene-glycol ethoxylate.
Claim 3
Dependent Claim
28 words
A device according to claim 1 wherein the polypropylene-glycol ethoxylate is polypropylene-glycol 1750 condensed with about 150 molecules of ethylene oxide of an average molecular weight of 8,300.
Claim 4
Dependent Claim
27 words
A device according to claim 1 wherein the substrate is a non-reactive plastic in a shape selected from the group consisting of strips, thin rods and platelets.
Claim 5
Dependent Claim
39 words
A device according to claim 1 wherein a coupler substance capable of coupling with the oxidation product resulting from the oxidation of para-ethyl-oxyethylamino-aniline by chlorine and thus forming a new dyestuff is incorporated in the layer on the substrate.
Claim 6
Dependent Claim
45 words
A device according to claim 1 wherein a coupler substance capable of coupling with the oxidation product resulting from the oxidation of para-ethyl-oxyethylamino-aniline by chlorine and thus forming a new dyestuff is fixed on the substrate in a layer separate from that containing the para-ethyl-oxyethylamino-aniline.
Claim 7
Dependent Claim
21 words
A device according to claim 4 wherein the coupling substance is selected from the group consisting of 1-naphthol and derivatives thereof.
Claim 8
Dependent Claim
35 words
A device according to claim 1 having fixed to the substrate at least one layer in addition to the active reagent layer containing a substance selected from the group consisting of buffers and pH modifiers.
Claim 9
Dependent Claim
13 words
A device according to claim 7 wherein the pH modifier is lithium carbonate.
Claim 10
Dependent Claim
27 words
A device according to claim 1 wherein a layer of an iodide capable of liberating fixed chlorine in the tested sample is adhered to the said substrate.
References Cited (Backward Citations)
US3122420A
Cited
US3329486A
Cited
US3811840A
Cited
US3701633A
Cited
US3843325A
Cited
US3873269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |