US3468787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphite electrodes with double-walled loop current leakage seal and electrolytic cell therewith
Assignee: Chemech Engineering Ltd
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Filing: 1967-08-31
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Granted: 1969-09-23
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Expires: 1987-08-31
Abstract
No abstract record available.
Inventors
- 👤 Gothe O Westerlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:53
CPC Classifications
C; C25; C25B; C25B11/00
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) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |