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Patent US2450737A successfully refreshed from Google Patents.
US2450737A
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Oil centrifuge with plural concentric separating zones
Assignee: Devlieg Bullard Inc
•
Filing: 1943-02-12
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Granted: 1948-10-05
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Expires: 1963-02-12
Abstract
No abstract record available.
Inventors
- 👤 Bennett C Rundquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:04
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/04; B04B1/06; Y; Y10; Y10S; Y10S494/00; Y10S494/901
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) | 1951-10-05 | 1952-04-05 | 1952-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-05 | 1956-04-05 | 1956-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-05 | 1960-04-05 | 1960-10-05 | $7700.00 | Window Closed / Lapsed |