Patent US2837172A successfully refreshed from Google Patents.
US2837172A
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Centrifugal separator
Assignee: National Research Council Canada
•
Filing: 1955-09-15
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Granted: 1958-06-03
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Expires: 1975-09-15
Abstract
No abstract record available.
Inventors
- 👤 Klein George Johann
- 👤 Baker Douglas Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:46
CPC Classifications
B; B04; B04C; B04C7/00; D; D21; D21D; D21D5/00; D21D5/18; Y; Y10; Y10S; Y10S55/00; Y10S55/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2067710A
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US2347731A
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US2553175A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |