US3180760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing secondary dry cells with lead electrodes and sulfuric acid electrolyte
Assignee: Marc Inc
•
Filing: 1961-03-03
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Granted: 1965-04-27
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Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
- 👤 Rauter Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:54
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/06; H01M10/12; H01M10/128; H01M10/08; H01M10/10; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
METHOD OF PRODUCING SECONDARY DRY CELLS WITH LEAD ELECTRODES AND THIXOTROPIC SULFURIC ACID ELECTROLYTE WHICH CONTAINS IN ADDITION TO SULFURIC ACID A COLLOIDALY DISPERSED SILICIC ACID WITH A PURITY DEGREE OF SUBSTANTIALLY 99.9%, CONSISTING IN SUBJECTING THE ELECTRODES PLACED IN THE CELL HOUSING, IMMEDIATELY AFTER THEY HAVE UNDERGONE A PRE-TREATMENT WITH DILLUTED SULFURIC ACID, TO A VACUUM FOR A PREDETERMINED EFFECTIVE PERIOD DURING WHICH THERE IS CONTINUOUS EXHAUSTION OF THE GASES LIBERATED, LIQUIFYING THE HIGH-PURITY THIXOTROPIC ELECTROLYTE COMPOSED OF DILUTED SULFURIC ACID AND THE SAID COLLOIDALLY DISPERSED SILICIC ACID IN A HIGH-SPEED MIXER, INTRODUCING THE LIQUIDFIELD ELECTROLYTE INTO THE CELL HOUSING PLACED IN THE ELVACUATED SPACE, AND THEREAFTER SUBJECTING THE INTRODUCED ELECTROLYTE TO ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
115 words
METHOD OF PRODUCING SECONDARY DRY CELLS WITH LEAD ELECTRODES AND THIXOTROPIC SULFURIC ACID ELECTROLYTE WHICH CONTAINS IN ADDITION TO SULFURIC ACID A COLLOIDALY DISPERSED SILICIC ACID WITH A PURITY DEGREE OF SUBSTANTIALLY 99.9%, CONSISTING IN SUBJECTING THE ELECTRODES PLACED IN THE CELL HOUSING, IMMEDIATELY AFTER THEY HAVE UNDERGONE A PRE-TREATMENT WITH DILLUTED SULFURIC ACID, TO A VACUUM FOR A PREDETERMINED EFFECTIVE PERIOD DURING WHICH THERE IS CONTINUOUS EXHAUSTION OF THE GASES LIBERATED, LIQUIFYING THE HIGH-PURITY THIXOTROPIC ELECTROLYTE COMPOSED OF DILUTED SULFURIC ACID AND THE SAID COLLOIDALLY DISPERSED SILICIC ACID IN A HIGH-SPEED MIXER, INTRODUCING THE LIQUIDFIELD ELECTROLYTE INTO THE CELL HOUSING PLACED IN THE ELVACUATED SPACE, AND THEREAFTER SUBJECTING THE INTRODUCED ELECTROLYTE TO ATMOSPHERIC PRESSURE.
References Cited (Backward Citations)
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GB336113A
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GB630182A
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US2748034A
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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) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |