US3759813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic cell
Assignee: PPG Industries Inc
•
Filing: 1971-07-01
•
Granted: 1973-09-18
•
Expires: 1991-07-01
Abstract
Abstract A NOVEL BIPOLAR UNIT FOR USE IN BIPOLAR DIAPHRAM CELL ELECTROLYZERS IS DISCLOSED. BOTH MEMBERS OF THE BACKPLATE OF THE BIPOLAR UNIT-THE ANODIC SURFACE AND THE CATHODIC SURFACE-ARE METALLIC. THE BAKCPLATE IS PARTICULARLY RESISTANT TO HYDROGEN-INDUCED STRUCTURAL FAILURE.
Inventors
- 👤 C Raetzsch
- 👤 W Darlington
- 👤 H Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:43
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/60; C25B9/63; C25B9/70
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |