US3694154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hydrogen peroxide from aqueous acidic solution obtained by hydrolysis
Assignee: FMC Corp
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Filing: 1968-01-23
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Granted: 1972-09-26
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Expires: 1988-01-23
Abstract
Abstract PROCESS FOR MAKING H2O2 FROM THE SOLUTION OBTAINED BY ELECTROLYSIS OF AN AQUEOUS AMMONIUM SULFATE-SULFURIC ACID MIXTURE. AFTER AN INITIAL STEP OF PARTIAL CONCENTRATION UNDER VACUUM, THE SOLUTION IS THEN TREATED AT ABOUT ATMOSPHERIC PRESSURE (OR HIGHER), USING SUCESSIVE STEPS OF HEAT TREATING TO EFFECT HYDROLYSIS, STEAM STRIPPING, PARTIAL CONDENSATION TO FORM A LIQUID ENRICHED IN H2O2, AND RECTIFICATION, TO PRODUCE ABOUT 35% H2O2.
Inventors
- 👤 William Sheridan Harper
- 👤 David Wayne Daigler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:55
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/03
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |