US3645696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for stabilizing chromogenic test reagent for aldehyde
Assignee: Cities Service Oil Co
•
Filing: 1970-04-30
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Granted: 1972-02-29
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Expires: 1990-04-30
Abstract
Abstract A chromogenic reagent normally unstable upon exposure to air is stabilized for use in an aldehyde detection test. The chromogenic reagent, preferably 3-methyl - 2-benzothiazolinone hydrazone hydrochloride monohydrate (MBTH), is prepared by adsorption on a suitable supporting media and drying in an inert atmosphere.
Inventors
- 👤 Rudolph L Iannacone
- 👤 Anthony J Revukas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:31
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; Y; Y10; Y10S; Y10S436/00; Y10S436/904; Y10T; Y10T436/00; Y10T436/20; Y10T436/203332
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
21 words
The method of claim 1 further comprising simultaneously drying the chromogenic reagent adsorbed on the support media in the inert atmosphere.
Claim 2
Dependent Claim
15 words
The method of claim 2 in which the adsorbed reagent is subsequently exposed to air.
Claim 3
Dependent Claim
14 words
The method of claim 3 in which the solvent is deionized or distilled water.
Claim 4
Dependent Claim
25 words
The method of claim 4 in which 0.1 to 1.0 gram of 3-methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate is adsorbed for each 100 grams of support media.
Claim 5
Dependent Claim
13 words
The method of claim 5 in which the support media is silica gel.
Claim 6
Dependent Claim
25 words
The method of claim 6 in which the inert atmosphere is provided by introducing a continuous flow of dry nitrogen gas through the silica gel.
Claim 7
Dependent Claim
18 words
The method of claim 6 in which the silica gel is of a 28 to 200 mesh size.
Claim 8
Dependent Claim
23 words
The method of claim 2 in which the chromogenic reagent and support media are dried at a temperature less than about 100* C.
Claim 9
Dependent Claim
20 words
The method of claim 9 further comprising sealing the dried chromogenic reagent adsorbed on the support media in a container.
Claim 10
Dependent Claim
13 words
The method of claim 2 in which the support media is particulate polyethylene.
Claim 11
Dependent Claim
13 words
The method of claim 11 in which the polyethylene is in chipped form.
References Cited (Backward Citations)
US3121615A
Cited
US3388075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |