Patent US3297404A successfully refreshed from Google Patents.
US3297404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrogen peroxide
Assignee: EIDP Inc
•
Filing: 1957-07-08
•
Granted: 1967-01-10
•
Expires: 1977-07-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Elliott
- 👤 James H Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:33
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013; C01B15/0135
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE METHOD OF REMOVING ANION IMPURITIES FROM ACIDIC IMPURE AQUEOUS HYDROGEN PEROXIDE HAVING A PH NOT MORE THAN 2 PH UNITS ABOVE THE PH REPRESENTING ITS EQUIVALENCE POINT AND AN H2O2 CONTENT OF AT LEAST 15% BY WEIGHT, SAID METHOD COMPRISING INTIMATELY CONTACTING SAID IMPURE AQUEOUS HYDROGN PEROXIDE AT A TEMPERATURE NOT EXCEEDING 40*C. UNDER FLUID FLOW CONTITIONS WITH AN ANION-EXCHANGE RESIN HAVING FUNCTIONAL QUATERNARY AMMONIUM GROUPS WHOSE BASIC NITROGEN ATOMS ARE ATTACHED THROUGH SATURATED ALIPHATIC HYDROCARBON GROUPS TO THE AROMATIC NUCLEI OF A CROSS-LINKED COPOLYMER OF STYRENE AND DIVINYL BENZENE, SAID RESIN BEING IN THE FORM OF A SALT SELECTED FROM THE GROUP CONSISTING OF THE CARBONATE AND THE BICARBONATE SALTS OF SAID RESIN, AND SAID IMPRUE AQUEOUS HYDROGEN PEROXIDE CONTAINING AS IMPURITIES ANIONS OTHER THAN THE ANION OF SAID SELECTED SALT, THEN SEPARATING THE RESIN AND THE AQUEOUS HYDROGEN PEROXIDE.
Claim 2
Independent Claim
142 words
THE METHOD OF REMOVING ANION IMPURITIES FROM ACIDIC IMPURE AQUEOUS HYDROGEN PEROXIDE HAVING A PH NOT MORE THAN 2 PH UNITS ABOVE THE PH REPRESENTING ITS EQUIVALENCE POINT AND AN H2O2 CONTENT OF AT LEAST 15% BY WEIGHT, SAID METHOD COMPRISING INTIMATELY CONTACTING SAID IMPURE AQUEOUS HYDROGN PEROXIDE AT A TEMPERATURE NOT EXCEEDING 40*C. UNDER FLUID FLOW CONTITIONS WITH AN ANION-EXCHANGE RESIN HAVING FUNCTIONAL QUATERNARY AMMONIUM GROUPS WHOSE BASIC NITROGEN ATOMS ARE ATTACHED THROUGH SATURATED ALIPHATIC HYDROCARBON GROUPS TO THE AROMATIC NUCLEI OF A CROSS-LINKED COPOLYMER OF STYRENE AND DIVINYL BENZENE, SAID RESIN BEING IN THE FORM OF A SALT SELECTED FROM THE GROUP CONSISTING OF THE CARBONATE AND THE BICARBONATE SALTS OF SAID RESIN, AND SAID IMPRUE AQUEOUS HYDROGEN PEROXIDE CONTAINING AS IMPURITIES ANIONS OTHER THAN THE ANION OF SAID SELECTED SALT, THEN SEPARATING THE RESIN AND THE AQUEOUS HYDROGEN PEROXIDE.
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |