US2687879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for heating solid materials, particularly for the calcination of limestone
Assignee: Roechlingsche Eisen und Stahlwerke GmbH
•
Filing: 1950-08-16
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Granted: 1954-08-31
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Expires: 1970-08-16
Abstract
No abstract record available.
Inventors
- 👤 Heiligenstaedt Hans Eri Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:37
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1669012A
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US1895284A
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US2037809A
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US2113522A
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US2451024A
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US2523835A
Cited
US2470543A
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US2595574A
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US2552063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |