US2650481A
Expired / Lapsed
US
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Separation of gaseous mixtures
Assignee: MW Kellogg Co
•
Filing: 1948-01-27
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Granted: 1953-09-01
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Expires: 1968-01-27
Abstract
No abstract record available.
Inventors
- 👤 George T Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:43
CPC Classifications
F; F25; F25J; F25J5/00; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/908; Y10S62/909
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |