Patent US3756930A successfully refreshed from Google Patents.
US3756930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroly recovery of chlorine and hydrogen from aqueous hydrochloric
Assignee: BASF SE
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Filing: 1971-06-28
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Granted: 1973-09-04
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Expires: 1991-06-28
Abstract
Abstract AQUEOUS HYDROCHLORIC ACID IS ELECTROLYZED IN A DIAPHRAGM CELL TO RECOVER CHLORINE AND HYDROGEN THEREFROM. THE ACID TO BE ELCTROLYZED SHOULD HAVE A CONCENTRATION OF FROM 18 TO 28% BY WEIGHT OF HCL AND SHOULD BE DEGRADED BY NOT MORE THAN 2% BY WEIGHT DURING ITS PASSAGE THROUGH THE CELL. THE MEAN TEMPERATURE IN THE CELL IS KEPT AT FROM 75* TO 90*C.
Inventors
- 👤 G Weiss
- 👤 H Weller
- 👤 E Wygasch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:03
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/24; C25B1/26
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |