US3429661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of finely divided,non-pyrophoric nitrides of zirconium,hafnium,niobium,and tantalum
Assignee: BASF Schweiz AG
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Filing: 1965-12-02
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Granted: 1969-02-25
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Expires: 1985-12-02
Abstract
No abstract record available.
Inventors
- 👤 Ernst Neuenschwander
- 👤 Klaus Schuett
- 👤 Walter Scheller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:37
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/076; C01B21/0763; B; B82; B82Y; B82Y30/00; C01B21/0615; C01B21/0617; C01P; C01P2002/00; C01P2002/70; C01P2002/77; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/10; C01P2006/12
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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |