US2447746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guided free film distillation method
Assignee: Atlantic Richfield Co
•
Filing: 1945-01-29
•
Granted: 1948-08-24
•
Expires: 1965-01-29
Abstract
No abstract record available.
Inventors
- 👤 Saymour W Ferris
- 👤 Edward R Lamson
- 👤 Douglas M Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:01
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/12; Y; Y10; Y10S; Y10S118/00; Y10S118/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2343666A
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US2363247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |