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US2667340A
Expired / Lapsed
US
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Gas-liquid contact apparatus
Assignee: Balfour Beatty PLC
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Filing: 1951-11-27
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Granted: 1954-01-26
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Expires: 1971-11-27
Abstract
No abstract record available.
Inventors
- 👤 Robson Briton Selby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:45
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/26; B01D47/00; B01D47/10
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |