US3073675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of ionic impurities from calcined alumina
Assignee: Atlantic Richfield Co
•
Filing: 1960-03-01
•
Granted: 1963-01-15
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Expires: 1980-03-01
Abstract
No abstract record available.
Inventors
- 👤 Leonard N Leum
- 👤 Jr James E Connor
- 👤 John J Rothrock
- 👤 Clifford S Shipley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:43
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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CA565712A
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US2405275A
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US2586882A
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US2946660A
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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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |