US2504053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent recovery by distillation
Assignee: IOWA STATE COLLEGE RES FOUND
•
Filing: 1946-10-04
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Granted: 1950-04-11
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Expires: 1966-10-04
Abstract
No abstract record available.
Inventors
- 👤 Orland R Sweeney
- 👤 Lionel K Arnold
- 👤 Hollowell Eugene Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:12
CPC Classifications
B; B01; B01D; B01D5/00; B01D5/0033; B01D5/0036; B01D5/0003; B01D5/0009; B01D5/0057; B01D5/006; B01D5/0063; B01D5/0078; B01D5/009
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) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |