Patent US3033908A successfully refreshed from Google Patents.
US3033908A
Expired / Lapsed
US
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Production of lead dioxide
Assignee: Union Carbide Corp
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Filing: 1959-06-02
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Granted: 1962-05-08
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Expires: 1979-06-02
Abstract
No abstract record available.
Inventors
- 👤 Jr William G Darland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:04
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/56; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A PROCESS FOR PRODUCING AN ALLOTROPE OF LEAD DIOXIDE HAVING IMPROVED DEPOLARIZING ACTIVITY, COMPRISING PROVIDING A SALT BATH CONTAINING AN AQUEOUS SOLUTION OF LEAD ACETATE, PROVIDING AN ANODE AND AN INERT CATHODE IN SAID BATH, AND PASSING DIRECT CURRENT OF ABOUT 5 TO ABOUT 10 VOLTS SUCH AS TO PROVIDE A CURRENT DENSITY RANGING FROM ABOUT 35 TO ABOUT 50 AMPERES PER SQUARE FOOT OF ANODE AREA BETWEEN SAID ANODE AND CATHODE WHILE SAID BATH IS MAINTAINED AT A TEMPERATURE RANGING FROM ROOM TEMPERATURE TO ABOUT 80* C. AND THERMALLY CONVERTING THE PLATED MATERIAL TO DENSE BLACK RHOMOHEDRAL SNOW-LIKE FLAKED CRYSTALS BY HEATING THE SAME IN A CONFINED ENCLOSURE TO A TEMPERATURE AROUND 110* C.
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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |