US1942522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic extraction of pure aluminum
Assignee: Individual
•
Filing: 1927-11-11
•
Granted: 1934-01-09
•
Expires: 1947-11-11
Abstract
No abstract record available.
Inventors
- 👤 Weber Julius
- 👤 Zeerleder Alfred Von
- 👤 Treadwell William Dupre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:19
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/24
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) | 1937-01-08 | 1937-07-10 | 1938-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-08 | 1941-07-10 | 1942-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-08 | 1945-07-10 | 1946-01-09 | $7700.00 | Window Closed / Lapsed |