Patent US2650085A successfully refreshed from Google Patents.
US2650085A
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US
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Apparatus for the purification of calcium
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1946-07-29
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Granted: 1953-08-25
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Expires: 1966-07-29
Abstract
No abstract record available.
Inventors
- 👤 Burnett Robert Le Grice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:14
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2330143A
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US2328479A
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US2387677A
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US2372168A
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US2375198A
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US2399180A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |