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US2856072A
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Centrifugal separators
Assignee: Individual
•
Filing: 1955-05-04
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Granted: 1958-10-14
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Expires: 1975-05-04
Abstract
No abstract record available.
Inventors
- 👤 Kronstad Haavard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:40
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2783887A
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US978238A
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US2375826A
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US2648433A
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US2642991A
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US2701642A
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DE854033C
Cited
US2724503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |