Patent US2818330A successfully refreshed from Google Patents.
US2818330A
Expired / Lapsed
US
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Preparation of refractory metals
Assignee: Ethyl Corp
•
Filing: 1953-10-07
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Granted: 1957-12-31
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Expires: 1973-10-07
Abstract
No abstract record available.
Inventors
- 👤 Harold A Beatty
- 👤 Thomas P Whaley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:46
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US914354A
Cited
US2034372A
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US2207461A
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US2471899A
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US2382723A
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US2468660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |