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US2489903A
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Assignee: Lummus Technology LLC
•
Filing: 1946-01-21
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Granted: 1949-11-29
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Expires: 1966-01-21
Abstract
No abstract record available.
Inventors
- 👤 Wheaton W Kraft
- 👤 Lambert Pierre
- 👤 Charles F Montross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:04
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/06; C; C10; C10G; C10G7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US977171A
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US1041589A
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US1783813A
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US1775362A
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US1883908A
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GB337885A
Cited
US1966241A
Cited
US1917606A
Cited
US2037316A
Cited
US2214658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |