US2761668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for exchanging heat between solid materials and a fluid medium
Assignee: FLSmidth and Co AS
•
Filing: 1951-12-12
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Granted: 1956-09-04
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Expires: 1971-12-12
Abstract
No abstract record available.
Inventors
- 👤 Sylvest Karl Jens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:04
CPC Classifications
F; F28; F28D; F28D13/00; F27; F27B; F27B7/00; F27B7/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1340267A
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US2313052A
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US2590090A
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US2629938A
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US2589730A
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US2595822A
Cited
US2610842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |