Patent US2949343A successfully refreshed from Google Patents.
US2949343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifying hydrogen peroxide
Assignee: Shell USA Inc
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Filing: 1955-09-06
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Granted: 1960-08-16
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Expires: 1975-09-06
Abstract
No abstract record available.
Inventors
- 👤 Hood George Clement
- 👤 Smith Randolph Eugene
- 👤 Pierotti Gino John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:46
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
THE METHOD OF PURIFYING AQUEOUS HYDROGEN PEROXIDE SOLUTION OF AT LEAST 20% HYDROGEN PEROXIDE CONTENT CONTAINING AS IMPURITIES LOWER ALIPHATIC ALCOHOL, LOWER ALIPHATIC CARBONYL COMPOUND CORRESPONDING TO THE ALCOHOL, AND ORGANIC IMPURITIES COMPRISING OTHER OXYGENATED ORGANIC COMPOUNDS THAN THE ALCOHOL AND CARBONYL COMPOUND AND INCLUDING ORGANIC PEROXIDIC MATERIALS OF DIVERGENT VOLATILITIES AND STABILITIES, WHICH COMPRISES FRACTIONALLY DISTILLING SAID SOLUTION IN A FRACTIONATION ZONE TO TAKE IMPURITIES COMPRISING SAID LOWER ALIPHATIC ALCOHOL AND SAID CORRESPONDING CARBONYLIC COMPOUND OVERHEAD AND TO LEAVE AS BOTTOMS PRODUCT AN AQUEOUS SOLUTION OF HYDROGEN PEROXIDE COMPRISING RESIDUAL ORGANIC IMPURITIES COMPRISING SAID ORGANIC PEROXIDE MATERIALS OF DIVERGENT VOLATILITIES AND STABILITIES, PASSING SAID DISTILLATION BOTTOMS INTO AN EXTRACTION ZONE, INTIMATELY CON-
Claim 2
Independent Claim
113 words
THE METHOD OF PURIFYING AQUEOUS HYDROGEN PEROXIDE SOLUTION OF AT LEAST 20% HYDROGEN PEROXIDE CONTENT CONTAINING AS IMPURITIES LOWER ALIPHATIC ALCOHOL, LOWER ALIPHATIC CARBONYL COMPOUND CORRESPONDING TO THE ALCOHOL, AND ORGANIC IMPURITIES COMPRISING OTHER OXYGENATED ORGANIC COMPOUNDS THAN THE ALCOHOL AND CARBONYL COMPOUND AND INCLUDING ORGANIC PEROXIDIC MATERIALS OF DIVERGENT VOLATILITIES AND STABILITIES, WHICH COMPRISES FRACTIONALLY DISTILLING SAID SOLUTION IN A FRACTIONATION ZONE TO TAKE IMPURITIES COMPRISING SAID LOWER ALIPHATIC ALCOHOL AND SAID CORRESPONDING CARBONYLIC COMPOUND OVERHEAD AND TO LEAVE AS BOTTOMS PRODUCT AN AQUEOUS SOLUTION OF HYDROGEN PEROXIDE COMPRISING RESIDUAL ORGANIC IMPURITIES COMPRISING SAID ORGANIC PEROXIDE MATERIALS OF DIVERGENT VOLATILITIES AND STABILITIES, PASSING SAID DISTILLATION BOTTOMS INTO AN EXTRACTION ZONE, INTIMATELY CON-
References Cited (Backward Citations)
US2059569A
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US2158525A
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US2298064A
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US2461988A
Cited
US2479111A
Cited
US2749291A
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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) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |