US2528974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for centrifugal separation
Assignee: Process Development Corp
•
Filing: 1945-09-19
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Granted: 1950-11-07
•
Expires: 1965-09-19
Abstract
No abstract record available.
Inventors
- 👤 Howard P Ritsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:02
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B5/30; B03B5/32; B04; B04B; B04B1/00; B04B1/20; B04B5/00; B04B5/10; B04B2001/205; B04B2001/2058
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |