US2633291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal machine
Assignee: Dresser Operations Inc
•
Filing: 1946-10-25
•
Granted: 1953-03-31
•
Expires: 1966-10-25
Abstract
No abstract record available.
Inventors
- 👤 William E Trumpler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:07
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/58; F04D29/582; F04D29/584
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1373896A
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US890355A
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US1221822A
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US1037243A
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US1957699A
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CH171467A
Cited
US2221225A
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US2305226A
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US2304993A
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US2407987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |