US2584985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of oxygen by rectification of air involving precooling the air
Assignee: Hydrocarbon Research Inc
•
Filing: 1948-04-08
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Granted: 1952-02-12
•
Expires: 1968-04-08
Abstract
No abstract record available.
Inventors
- 👤 Michael J Cicalese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:47
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F28; F28D; F28D17/00; F28D7/00; F28D7/0066; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/909
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1724513A
Cited
US2141997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |