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Patent US2808103A successfully refreshed from Google Patents.
US2808103A
Expired / Lapsed
US
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Crystallizing evaporators, vertical current classifiers and the like
Assignee: Individual
•
Filing: 1955-11-14
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Granted: 1957-10-01
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Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 Robert S Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:19
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/06; B01D9/00; B01D9/0018; B01D9/0036
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US642460A
Cited
US1781742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |