US2448491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air separating system and process
Assignee: Arthur D Little Inc
•
Filing: 1944-11-06
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Granted: 1948-08-31
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Expires: 1964-11-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Allen Latham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:27
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04763; F25J3/04866; F25J3/044; F25J3/04975; F25J3/04981; F25J2200/00; F25J2200/70; F25J2240/00; F25J2240/40; F25J2240/42; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR559109A
Cited
US1919500A
Cited
US2000906A
Cited
US1968518A
Cited
US2089543A
Cited
US2137260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-31 | 1952-03-01 | 1952-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-31 | 1956-03-01 | 1956-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-31 | 1960-03-01 | 1960-08-31 | $7700.00 | Window Closed / Lapsed |