Patent US2684889A successfully refreshed from Google Patents.
US2684889A
Expired / Lapsed
US
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Method of manufacturing highly purified hydrogen
Assignee: BUFFALO ELECTRO CHEM CO
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Filing: 1951-04-12
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Granted: 1954-07-27
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Expires: 1971-04-12
Abstract
No abstract record available.
Inventors
- 👤 George G Crewson
- 👤 Max E Bretschger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:55
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF MANUFACTURING AQUEOUS HYDROGEN PEROXIDE OF HIGH PURITY AND OXYGEN CONTENT WHICH COMPRISES SUBJECTING A FEED SOLUTION OF AN IMPURE ACIDIC AQUEOUS SOLUTION OF HYDROGEN PEROXIDE TO PARTIAL DISTILLATION UNDER VACUUM TO FORM VAPORS OF HYDROGEN PEROXIDE AND WATER UNTIL THE IMPURITIES IN THE LIQUID PHASE HAVE INCREASED AT LEAST ABOUT SEVEN FOLD, WITHDRAWING THE IMPURE CONCENTRATED LIQUID PHASE RESIDUE, CONDENSING AND RECTIFYING THE VAPORS TO PRODUCE A RELATIVELY PURE AQUEOUS HYDROGEN PEROXIDE, AND RECYCLING A PORTION OF SAID PURE PEROXIDE, TO MIX WITH THE FEED OF IMPURE PEROXIDE.
Claim 2
Independent Claim
91 words
THE METHOD OF MANUFACTURING AQUEOUS HYDROGEN PEROXIDE OF HIGH PURITY AND OXYGEN CONTENT WHICH COMPRISES SUBJECTING A FEED SOLUTION OF AN IMPURE ACIDIC AQUEOUS SOLUTION OF HYDROGEN PEROXIDE TO PARTIAL DISTILLATION UNDER VACUUM TO FORM VAPORS OF HYDROGEN PEROXIDE AND WATER UNTIL THE IMPURITIES IN THE LIQUID PHASE HAVE INCREASED AT LEAST ABOUT SEVEN FOLD, WITHDRAWING THE IMPURE CONCENTRATED LIQUID PHASE RESIDUE, CONDENSING AND RECTIFYING THE VAPORS TO PRODUCE A RELATIVELY PURE AQUEOUS HYDROGEN PEROXIDE, AND RECYCLING A PORTION OF SAID PURE PEROXIDE, TO MIX WITH THE FEED OF IMPURE PEROXIDE.
References Cited (Backward Citations)
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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) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |