US2646977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor liquid contact apparatus
Assignee: Lummus Technology LLC
•
Filing: 1951-03-21
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Granted: 1953-07-28
•
Expires: 1971-03-21
Abstract
No abstract record available.
Inventors
- 👤 Wheaton W Kraft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:55
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01D3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1738870A
Cited
US1811247A
Cited
US1938247A
Cited
US2202071A
Cited
US2366958A
Cited
US2558222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |