US3770381A
Expired / Lapsed
US
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Process for the determination of peroxides
Assignee: Merck Patent GmbH
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Filing: 1972-03-21
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Granted: 1973-11-06
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Expires: 1992-03-21
Abstract
Abstract A process for semiquantitative colorimetric detection of organic peroxides, especially ether peroxides, with the aid of peroxide indicating means comprising an absorbent carrier impregnated with peroxides, a colorimetric indicator, optionally a buffer, and optionally other additives. The indicating means is immersed in a solution of peroxides in a volatile organic solvent having a boiling point of below 80* C., preferably of below 50* C., and withdrawn. The indicating means is placed in a water vapor atmosphere having a relatively constant temperature between about 20 and 100* C. to evaporate the organic solvent and deposit moisture on the surface thereof, and then examined for color change.
Inventors
- 👤 D Schmitt
- 👤 A Stein
- 👤 W Baumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:19
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/26; C12Q1/28; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
20 words
A process according to claim 1, wherein said moist gas is air having a relative humidity of about 90 percent.
Claim 2
Dependent Claim
19 words
A process according to claim 1, wherein said moist gas is air having a temperature of about 36* C.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein said moist gas is exhaled human breath.
Claim 4
Dependent Claim
50 words
A process according to claim 1, wherein said peroxide is a peroxide of a higher boiling ether, further comprising diluting said peroxide with a peroxide-free volatile organic solvent to form a mixture having a boiling poing of less than 80* C., and moistening said peroxide indicating means with said mixture.
Claim 5
Dependent Claim
19 words
A process according to claim 1, wherein said volatile organic solvent has a boiling point above about 36* C.
Claim 6
Dependent Claim
13 words
A process according to claim 1, wherein said peroxide is an ether peroxide.
Claim 7
Dependent Claim
15 words
A process according to claim 7, wherein said volatile organic solvent is a peroxide-free ether.
Claim 8
Dependent Claim
12 words
A process according to claim 8, wherein said ether is diethyl ether.
Claim 9
Dependent Claim
14 words
A process according to claim 7, wherein said moist gas is exhaled human breath.
References Cited (Backward Citations)
US2595755A
Cited
US3183173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |