US3706644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regenerating spinel surfaced electrodes
Assignee: PPG Industries Inc
•
Filing: 1971-03-08
•
Granted: 1972-12-19
•
Expires: 1991-03-08
Abstract
Abstract A METHOD IS DISCLOSED FOR TREATING ELECTRODES, PARTICULARLY AFTER EXTENDED PERIODS OF USE. THIS METHOD IS PARTICULARLY USEFUL FOR ELECTRODES HAVING SPINEL SURFACES ON ELECTROCONDUCTIVE VALVE METAL SUBSTRATES, BUT MAY ALSO BE USED FOR ANY ELECTRODE HAVING AN OXIDE SURFACE ON A VALVE METAL SUBSTRATE. D R A W I N G
Inventors
- 👤 Aleksandrs Martinsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:29
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; C25B11/077; C25B11/0771
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |