US2520494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distilling column and the like
Assignee: Individual
•
Filing: 1948-07-23
•
Granted: 1950-08-29
•
Expires: 1968-07-23
Abstract
No abstract record available.
Inventors
- 👤 George A Dalin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:24
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/14; B01D3/16; B01D3/166
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US424047A
Cited
US1391996A
Cited
US1534733A
Cited
US1706014A
Cited
US1928289A
Cited
US2221302A
Cited
US2387479A
Cited
US2404059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |