US2945791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inert lead dioxide anode and process of production
Assignee: Individual
•
Filing: 1958-03-05
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Granted: 1960-07-19
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Expires: 1978-03-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Fred D Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:54
CPC Classifications
C; C25; C25D; C25D9/00; C25D9/04; C25D9/06; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/043; C25B11/044; C25B11/051; C25B11/054
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN THE PROCESS OF ELECTRO-DEPOSITING A LEAD DIOXIDE COATING ON A GRAPHITE ANODE, THE ELECTROLYTE CONSISTING ESSENTIALLY OF AN AQUEOUS ACID SOLUTION OF LEAD NITRATE IN A CONCENTRATION, AND AT A TEMPERATURE THAT WILL DEPOSIT LEAD DIOXIDE ON THE GRAPHITE ANODE AND A SURFACE ACTIVE AGENT, THE IMPROVEMENT COMPRISING VARYING THE ANODE CURRENT DENSITY FOR AT LEAST TWO SUCCESSIVE PERIODS OF ELECTRO-DEPOSITION, THE ANODE CURRENT DENSITY VARYING FROM ABOUT 75 TO 150 AMPERES PER SQUARE FOOT FOR THE PRIOR PERIOD OF ELECTRO-DEPOSITION TO ABOUT 20 TO 60 AMPERES PER SQUARE FOOT FOR THE SUCCEEDING PERIOD OF ELECTRODEPOSITION, TO COMPLETELY COVER THE GRAPHITE ANODE WITH A COMPACT, HARD, DENSE, SMOOTH COATING HAVING RANDOMLY ORIENTED CRYSTALS FIRMLY BOUND TO TYHE GRAPHITE BASE.
Claim 2
Dependent Claim
120 words
IN THE PROCESS OF ELECTRO-DEPOSITING A LEAD DIOXIDE COATING ON A GRAPHITE ANODE, THE ELECTROLYTE CONSISTING ESSENTIALLY OF AN AQUEOUS ACID SOLUTION OF LEAD NITRATE IN A CONCENTRATION, AND AT A TEMPERATURE THAT WILL DEPOSIT LEAD DIOXIDE ON THE GRAPHITE ANODE AND A SURFACE ACTIVE AGENT, THE IMPROVEMENT COMPRISING VARYING THE ANODE CURRENT DENSITY FOR AT LEAST TWO SUCCESSIVE PERIODS OF ELECTRO-DEPOSITION, THE ANODE CURRENT DENSITY VARYING FROM ABOUT 75 TO 150 AMPERES PER SQUARE FOOT FOR THE PRIOR PERIOD OF ELECTRO-DEPOSITION TO ABOUT 20 TO 60 AMPERES PER SQUARE FOOT FOR THE SUCCEEDING PERIOD OF ELECTRODEPOSITION, TO COMPLETELY COVER THE GRAPHITE ANODE WITH A COMPACT, HARD, DENSE, SMOOTH COATING HAVING RANDOMLY ORIENTED CRYSTALS FIRMLY BOUND TO TYHE GRAPHITE BASE.
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) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |