Patent US2589733A successfully refreshed from Google Patents.
US2589733A
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US
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Method of operating film evaporators
Assignee: Rosenblad Corp
•
Filing: 1946-09-11
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Granted: 1952-03-18
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Expires: 1966-09-11
Abstract
No abstract record available.
Inventors
- 👤 Rosenblad Curt Fredrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:10
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/22; Y; Y10; Y10S; Y10S159/00; Y10S159/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US377099A
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US1006197A
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US806696A
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US1013091A
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US1072670A
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US1778079A
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US2088213A
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US2374232A
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US2291228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |