Patent US3993731A successfully refreshed from Google Patents.
US3418258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of highly active metals of the iron group
Assignee: BASF SE
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Filing: 1965-02-15
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Granted: 1968-12-24
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Expires: 1985-02-15
Abstract
No abstract record available.
Inventors
- 👤 Siebert Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:44
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0407; C22B23/0415; B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/755; B01J25/00; C10; C10K; C10K3/00
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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |