US3664812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrogen peroxide
Assignee: Honeywell International Inc
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Filing: 1970-03-16
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Granted: 1972-05-23
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Expires: 1990-03-16
Abstract
Abstract A METHOD FOR PURIFYING AQUEOUS ACIDIC SOLUTIONS OF HYDROGEN PEROXIDE PREPARED BY AN ORGANIC ANTHRAQUINONE PROCESS WHICH COMPRISES THE ADDITION TO SAID SOLUTION OF AN OXIDE OR HYDROXIDE OF MAGNESIUM, CALCIUM, OR BARIUM EITHER AS A SOLID OR AS AN AQUEOUS SOLUTION IN AN AMOUNT TO RAISE THE PH OF THE SOLUTION TO ABOUT 6 TO 8.5 TO EFFECT PRECIPITATION OF THE IMPURITIES AND RECOVERING AN ESSENTIALLY PURE, STABLE HYDROGEN PEROXIDE SOLUTION.
Inventors
- 👤 Ernest B Hoyt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |