Patent US3361531A successfully refreshed from Google Patents.
US3361531A
Expired / Lapsed
US
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Removal of oxygen from gas mixtures
Assignee: Union Carbide Corp
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Filing: 1967-02-27
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Granted: 1968-01-02
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Expires: 1987-02-27
Abstract
No abstract record available.
Inventors
- 👤 Erb Ezra
- 👤 Adam H Malik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:17
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/708; A23B2/712; A23B2/717
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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |