US2769489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple effect evaporator
Assignee: Blaw Knox Co
•
Filing: 1954-09-14
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Granted: 1956-11-06
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Expires: 1974-09-14
Abstract
No abstract record available.
Inventors
- 👤 Albert W Eckstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:23
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/28; B01D1/2803; B01D1/2818; A; A23; A23C; A23C1/00; A23C1/12; B01D1/06; B01D1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US478458A
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US1387476A
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US1015704A
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US1258562A
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US1440026A
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US1878651A
Cited
US2217547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |