Patent US2489702A successfully refreshed from Google Patents.
US2489702A
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Topping with waste heat from cracking with spent shale
Assignee: CLARENCE H DRAGERT
•
Filing: 1946-07-20
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Granted: 1949-11-29
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Expires: 1966-07-20
Abstract
No abstract record available.
Inventors
- 👤 John W Coast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:51
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18; C10G1/00; C10G1/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1309890A
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US1523942A
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US1357278A
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US1467758A
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US1475901A
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US2054725A
Cited
US2406810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |