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US2575587A
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Carbonization apparatus
Assignee: Consolidation Coal Co
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Filing: 1948-04-14
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Granted: 1951-11-20
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Expires: 1968-04-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Caleb Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:26
CPC Classifications
C; C10; C10B; C10B55/00; C10B55/02; C10B55/04; C10B1/00; C10B1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1602819A
Cited
US1945530A
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DE585273C
Cited
US2114416A
Cited
US2151849A
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US2287437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |