Patent US3493692A successfully refreshed from Google Patents.
US2981776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage battery material
Assignee: NL Industries Inc
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Filing: 1959-06-10
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Granted: 1961-04-25
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Expires: 1979-06-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward Joseph Dunn
- 👤 Orsino Joseph Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:49
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/56; H01M4/57; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
A METHOD OF PREPARING A COMPOSITION SUITABLE FOR USE AS ACTIVE MATERIAL IN LEAD-ACID STORAGE BATTERY PLATES WHICH COMPRISES THE STEPS OF CONTINUOUSLY REACTING METALLIC LEAD AT A TEMPERATURE BETWEEN 621*F. AND 1630*F. WITH AIR IN A REACTION ZONE, SAID AIR BEING FED IN THE FORM OF A STREAM TO SAID REACTION ZONE, AND CONCURRENTLY ADDING SULFURIC ACID TO SAID STREAM OF AIR, SAID SULFURIC ACID BEING ADDED DROPWISE TO SAID STREAM OF AIR, SAID SULFURIC ACID REACTING SUBSTANTIALLY INSTANTANEOUSLY TO FORM LEAD SULFATE PRIOR TO ANY SUBSTANTIAL THERMAL DECOMPOSITION OF SAID ACID, AND CONTINUOUSLY WITHDRAWING A PRODUCT COMPRISING LEAD OXIDE IN AMOUNT BETWEEN 10 AND 70 PERCENT, LEAD SULFATE IN AMOUNT BETWEEN 6 AND 35 PERCENT AND METALLIC LEAD IN AMOUNT BETWEEN 10 AND 50 PERCENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |