US3919059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic cell
Assignee: PPG Industries Inc
•
Filing: 1974-07-02
•
Granted: 1975-11-11
•
Expires: 1994-07-02
Abstract
Abstract A novel bipolar unit for use in bipolar diaphragm cell electrolyzers is disclosed. Both members of the backplate of the bipolar unit-the anodic surface and the cathodic surface-are metallic. The backplate is particularly resistant to hydrogeninduced structural failure.
Inventors
- 👤 Carl W Raetzsch
- 👤 William B Darlington
- 👤 Hugh Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:57
CPC Classifications
C; C25; C25B; C25B11/00; C25B9/00; C25B9/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE METHOD OF ELECTROLYZING AN AQUEOUS ALKALI METAL CHLORIDE SOLUTION IN A BIPOLR ELECTROLYZE COMPRISING A BACKPLATE COMPRISING AN IRON CATHOLYTE SURFACE AND A VALVE METAL ANOLYTE SURFACE WHEREIN A PROTECTIVE SHEET IS INTERPOSED BETWEEN THE STEEL CATHOLYTE SURFACE AND THE SAID SOLUTION WHEREBY MOLECULAR HYDROGEN IS EVOLVE BETWEEN SAID STEEL CATHOLYTE SURFACE AND SAID PROTIVE SHEET.
Claim 2
Independent Claim
57 words
THE METHOD OF ELECTROLYZING AN AQUEOUS ALKALI METAL CHLORIDE SOLUTION IN A BIPOLR ELECTROLYZE COMPRISING A BACKPLATE COMPRISING AN IRON CATHOLYTE SURFACE AND A VALVE METAL ANOLYTE SURFACE WHEREIN A PROTECTIVE SHEET IS INTERPOSED BETWEEN THE STEEL CATHOLYTE SURFACE AND THE SAID SOLUTION WHEREBY MOLECULAR HYDROGEN IS EVOLVE BETWEEN SAID STEEL CATHOLYTE SURFACE AND SAID PROTIVE SHEET.
References Cited (Backward Citations)
US3219563A
Cited
US3410784A
Cited
US3553088A
Cited
US3441495A
Cited
US3563878A
Cited
US3684670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |