US2661808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification and separation of gas mixtures
Assignee: Linde GmbH
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Filing: 1950-10-10
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Granted: 1953-12-08
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Expires: 1970-10-10
Abstract
No abstract record available.
Inventors
- 👤 Kahle Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:15
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0438; B01D2259/00; B01D2259/40; B01D2259/402
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1548280A
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US1616242A
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US1934075A
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US1948779A
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US1959389A
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US2083732A
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US2535902A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |