US2676923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrogen peroxide
Assignee: EIDP Inc
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Filing: 1950-06-24
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Granted: 1954-04-27
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Expires: 1970-06-24
Abstract
No abstract record available.
Inventors
- 👤 James H Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013; C01B15/0135
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A METHOD OF REMOVING HEAVY METAL ION IMPURITIES FROM AN AQUEOUS HYDROGEN PEROXIDE SOLUTION CONTAINING AT LEAST 25% H2O2 BY WEIGHT COMPRISING WASHING A NUCLEAR SULFONATED AROMATIC HYDROCARBON CATION-EXCHANGE RESIN WITH AN AQUEOUS SOLUTION OF A STRONG MINERAL ACID UNTIL THE IRON TEST VALUE OF SAID RESIN IS SUBSTANTIALLY LESS THAN 30 P.P.M. FE, CONTACTING SAID HYDROGEN PEROXIDE SOLUTION AT A PH OF 0 TO 3.6 WITH SAID WASHED RESIN, AND DISCONTINUING SAID CONTACT BEFORE THE IRON TEST VALUE OF THE RESIN IN CONTACT WITH SAID HYDROGEN PEROXIDE SOLUTION HAS EXCEEDED 30 P.P.M. FE; SAID IRON TEST VALUE BEING THE FE CONTENT OF A 10% SULFURIC ACID SOLUTION AFTER IT HAS BEEN IN CONTACT FOR 10 MINUTES WITH ONE-HALF ITS WEIGHT OF A TEST SAMPLE OF SAID RESIN.
Claim 2
Independent Claim
128 words
A METHOD OF REMOVING HEAVY METAL ION IMPURITIES FROM AN AQUEOUS HYDROGEN PEROXIDE SOLUTION CONTAINING AT LEAST 25% H2O2 BY WEIGHT COMPRISING WASHING A NUCLEAR SULFONATED AROMATIC HYDROCARBON CATION-EXCHANGE RESIN WITH AN AQUEOUS SOLUTION OF A STRONG MINERAL ACID UNTIL THE IRON TEST VALUE OF SAID RESIN IS SUBSTANTIALLY LESS THAN 30 P.P.M. FE, CONTACTING SAID HYDROGEN PEROXIDE SOLUTION AT A PH OF 0 TO 3.6 WITH SAID WASHED RESIN, AND DISCONTINUING SAID CONTACT BEFORE THE IRON TEST VALUE OF THE RESIN IN CONTACT WITH SAID HYDROGEN PEROXIDE SOLUTION HAS EXCEEDED 30 P.P.M. FE; SAID IRON TEST VALUE BEING THE FE CONTENT OF A 10% SULFURIC ACID SOLUTION AFTER IT HAS BEEN IN CONTACT FOR 10 MINUTES WITH ONE-HALF ITS WEIGHT OF A TEST SAMPLE OF SAID RESIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |