US3508884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of sodium carbonate and sodium sulfate from bayer solutions
Assignee: Alcan Research and Development Ltd
•
Filing: 1967-02-03
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Granted: 1970-04-28
•
Expires: 1987-02-03
Abstract
No abstract record available.
Inventors
- 👤 Stephen Ostap
- 👤 Denis Bartok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:41
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/46; C01F7/47
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1417139A
Cited
US1759361A
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US1853275A
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US1869621A
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US2347053A
Cited
US2294778A
Cited
US2963363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |