US3784358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Support for chromogenic glycol test reagent
Assignee: Citgo Petroleum Corp
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Filing: 1971-09-24
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Granted: 1974-01-08
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Expires: 1991-09-24
Abstract
Abstract An improved supporting medium for a chromogenic reagent for use in an aldehyde detection test. The chromogenic reagent, preferably 3-methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate (MBTH), is absorbed on a porous polymeric material. The preferred polymeric supporting medium is a film of porous polyethylene. The chromogenic reagent supported on the porous polymer finds particular utility in a test for determining the presence of glycol in engine oil.
Inventors
- 👤 H Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:43
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
25 words
The supported chromogenic reagent of claim 1 wherein the porous polymeric supporting medium is selected from the group consisting of polyethylene, polypropylene, polystyrene, and nylon.
Claim 2
Dependent Claim
24 words
The supported chromogenic reagent of claim 2 wherein the polymer is in a physical form selected from the group consisting of particles and film.
Claim 3
Dependent Claim
40 words
The supported chromogenic reagent of claim 3 wherein said chromogenic reagent is 3-methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate and the porous polymeric supporting medium is a polyethylene film having a pore size within the range of from about 40 to 50 microns.
Claim 4
Dependent Claim
20 words
The supported chromogenic reagent of claim 4 which contains about 2 to 6 weight percent of 3-methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate.
Claim 5
Dependent Claim
18 words
The supported chromogenic reagent of claim 5 wherein said supported chromogenic reagent is sealed in a plastic beaker.
Claim 6
Dependent Claim
70 words
A method for the detection of glycol in oil comprising the steps: a. introducing a sample of the oil to be tested into an aqueous solution of an oxidizer which preferentially oxidizes glycol to an aldehyde; b. mixing the oil and aqueous solution containing the oxidizer; c. separating the aqueous and oil phases; and d. contacting a sample of said aqueous phase with the supported chromogenic reagent of claim 1.
Claim 7
Dependent Claim
60 words
The method of claim 7 wherein the oxidizer is selected from the group consisting of sodium periodate, potassium periodate, hydrogen peroxide, sodium perborate, cerric nitrate, cerric sulfate, and lead tetraacetate; and the supported chromogenic reagent is 3-methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate supported on a porous polyethylene film having a pore size within the range of from about 40 to 50 microns.
Claim 8
Dependent Claim
10 words
The method of claim 8 wherein the oil is acidic.
Claim 9
Dependent Claim
50 words
The method of claim 9 wherein the oxidizer is about a 0.001 to 1.0 molar aqueous solution of sodium periodate, and the oil and the aqueous sodium periodate solution are mixed for about 1 to 2 minutes and allowed thereafter to undergo phase separation for about 10 to 20 minutes.
Claim 10
Dependent Claim
61 words
The method of claim 10 wherein the glycol is ethylene glycol and the supported chromogenic reagent consists of about 2 to 6 weight percent of 3-methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate supported on a porous polyethylene film having a pore size within the range of from about 40 to 50 microns and wherein said supported chromogenic reagent is sealed in a plastic beaker.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |