Patent US3716471A successfully refreshed from Google Patents.
US3716471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode of petroleum coke and brown coal char
Assignee: University of Melbourne
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Filing: 1970-09-09
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Granted: 1973-02-13
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Expires: 1990-09-09
Abstract
Abstract A MATERIAL FOR USE IN ELECTRODES OF THE KIND EMPLOYED IN ELECTROLYTIC CELLS AND COMPRISING A MIXTURE OF PETROLEUM COKE AND BROWN COAL CHAR.
Inventors
- 👤 G Cullen
- 👤 J Graham
- 👤 N Siviour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:16
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/12; C25C3/125
Claims Analysis
Total Claims: 0
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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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |