US2446534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquefaction and rectification column
Assignee: Individual
•
Filing: 1943-09-15
•
Granted: 1948-08-10
•
Expires: 1963-09-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Fausek
- 👤 Irwing F Fausek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:07
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1394955A
Cited
FR679343A
Cited
US2091303A
Cited
US1976388A
Cited
US2193261A
Cited
US2147422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |