Patent US1721956A successfully refreshed from Google Patents.
Patent US2488746A successfully refreshed from Google Patents.
US2488746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifuge with centrifugally flushed filter
Assignee: De Laval Separator Co
•
Filing: 1946-03-16
•
Granted: 1949-11-22
•
Expires: 1966-03-16
Abstract
No abstract record available.
Inventors
- 👤 George J Strezynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:49
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/10; B04B1/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US560627A
Cited
US879255A
Cited
US1050622A
Cited
US1215337A
Cited
US1355559A
Cited
US1468376A
Cited
GB198387A
Cited
US1527074A
Cited
GB388966A
Cited
DE612803C
Cited
GB428188A
Cited
US2291117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |