US3666442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of beryllium
Assignee: Dow Chemical Co
•
Filing: 1968-11-26
•
Granted: 1972-05-30
•
Expires: 1988-11-26
Abstract
Abstract A METHOD FOR PREPARING A BERYLLIUM ENRICHED MATERIAL WHICH COMPRISES: COMMINUTING AN ALUMINUM-BERYLLIUM ALLOY TO OBTAIN A COARSE PARTICULATE FRACTION OF AN ALUMINUM-BERYLLIUM EUTECTIC COMPOSITION AND A FINE PARTICULATE FRACTION COMPRISING BERYLLIUM; AND SEPARATING THE COARSE PARTICULATE FRACTION FROM THE FINE PARTICULATE FRACTION.
Inventors
- 👤 Gilbert S Layne
- 👤 James O Huml
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:29
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/0038; C22B21/0069; C22B35/00; C22B7/00; C22B7/001; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |