US2657803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal filtration
Assignee: Lummus Technology LLC
•
Filing: 1949-09-01
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Granted: 1953-11-03
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Expires: 1969-09-01
Abstract
No abstract record available.
Inventors
- 👤 August H Sehutte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:50
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/28; B; B04; B04B; B04B3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1492168A
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US1749057A
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US2165807A
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US2370999A
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US2398967A
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US2394016A
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US2431142A
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US2440487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |