US2934426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of high purity pentachlorides of niobium and tantalum from mixtures thereof
Assignee: QUEBEC METALLURG IND Ltd
•
Filing: 1957-08-05
•
Granted: 1960-04-26
•
Expires: 1977-08-05
Abstract
No abstract record available.
Inventors
- 👤 Mayer Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:02
CPC Classifications
C; C01; C01G; C01G33/00; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1620880A
Cited
US2205854A
Cited
US2551733A
Cited
US2763542A
Cited
US2778726A
Cited
US2744060A
Cited
US2766112A
Cited
US2789896A
Cited
US2852446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |