US3507771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal anode for electrolytic cells
Assignee: Hoechst AG
•
Filing: 1967-09-18
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Granted: 1970-04-21
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Expires: 1987-09-18
Abstract
No abstract record available.
Inventors
- 👤 Ernst Donges
- 👤 Helmut Hund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:48
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/02; C25B1/00; C25B1/01; C25B1/34; C25B1/36
Claims Analysis
Total Claims: 0
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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) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |