Patent US2768745A successfully refreshed from Google Patents.
US2768745A
Expired / Lapsed
US
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Multi-stage concentrator
Assignee: Individual
•
Filing: 1953-10-12
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Granted: 1956-10-30
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Expires: 1973-10-12
Abstract
No abstract record available.
Inventors
- 👤 Floyd E Albertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:38
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/02; B04C5/04; B04C5/08; B04C5/103; B04C5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |