Patent US2507295A successfully refreshed from Google Patents.
US2507295A
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Drum structure with cooling means
Assignee: FLSmidth and Co AS
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Filing: 1947-07-31
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Granted: 1950-05-09
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Expires: 1967-07-31
Abstract
No abstract record available.
Inventors
- 👤 Borch Niels Sofus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:25
CPC Classifications
F; F28; F28D; F28D11/00; F27; F27B; F27B7/00; F27B7/20; F27B7/38; F28D11/02
Claims Analysis
Total Claims: 0
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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) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |