US3145979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drums
Assignee: FLSmidth and Co AS
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Filing: 1962-08-09
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Granted: 1964-08-25
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Expires: 1982-08-09
Abstract
No abstract record available.
Inventors
- 👤 Madsen Frederick Rancke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:16
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/14; F27B7/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A ROTARY DRUM HAVING A PLURALITY OF AXIALLY EXTENDING CONVEYOR FLIGHTS OF HELICAL FORM, MOUNTING MEANS WITHIN THE DRUM, AND A PLURALITY OF CHAINS EACH SECURED AT ONE END ONLY TO THE MOUNTING MEANS BETWEEN THE FLIGHTS, CHARACTERIZED IN THAT THE LENGTH OF EACH CHAIN IS BETWEEN 50% AND 150% OF THE INTERNAL DIAMETER OF THE DRUM, THE WIDTH OF EACH FLIGHT IS BETWEEN 12% AND 45% OF THE INTERNAL DIAMETER OF THE DRUM, AND THE INTERIOR OF THE DRUM INWARD FROM THE FREE EDGES OF THE FLIGHTS IS OPEN.
Claim 2
Dependent Claim
90 words
A ROTARY DRUM HAVING A PLURALITY OF AXIALLY EXTENDING CONVEYOR FLIGHTS OF HELICAL FORM, MOUNTING MEANS WITHIN THE DRUM, AND A PLURALITY OF CHAINS EACH SECURED AT ONE END ONLY TO THE MOUNTING MEANS BETWEEN THE FLIGHTS, CHARACTERIZED IN THAT THE LENGTH OF EACH CHAIN IS BETWEEN 50% AND 150% OF THE INTERNAL DIAMETER OF THE DRUM, THE WIDTH OF EACH FLIGHT IS BETWEEN 12% AND 45% OF THE INTERNAL DIAMETER OF THE DRUM, AND THE INTERIOR OF THE DRUM INWARD FROM THE FREE EDGES OF THE FLIGHTS IS OPEN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |