US3557537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust or sand separators
Assignee: Rolls Royce PLC
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Filing: 1969-11-06
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Granted: 1971-01-26
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Expires: 1989-11-06
Abstract
Abstract APPARATUS FOR SEPARATING SAND, DUST OR OTHER PARTICULATE MATTER FROM AIR INCLUDING A RING OF ROTOR VANES WHICH LIE WITHIN A RING OF GUIDE VANES AND ACT ON INWARDLY FLOWING DUST LADEN AIR TO CONCENTRATE THE DUST IN A ZONE FROM WHICH IT IS DISCHARGED.
Inventors
- 👤 Derek Aubrey Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/05; F02C7/052; B; B01; B01D; B01D45/00; B01D45/12; B01D45/14
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |