US2880929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal countercurrent contact devices
Assignee: WLADZIA G PODBIELNIAK
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Filing: 1951-06-07
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Granted: 1959-04-07
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Expires: 1971-06-07
Abstract
No abstract record available.
Inventors
- 👤 Podbielniak Walter Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:23
CPC Classifications
B; B04; B04B; B04B5/00; B04B5/06; B01; B01D; B01D11/00; B01D11/04; B01D11/0446; B01D11/0461
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US935311A
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US2281796A
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US2176982A
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US2286157A
Cited
US2234921A
Cited
US2266553A
Cited
US2619280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |