Patent US2933057A successfully refreshed from Google Patents.
US2933057A
Expired / Lapsed
US
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Furnace with dumping hearth
Assignee: Babcock and Wilcox Co
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Filing: 1958-01-20
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Granted: 1960-04-19
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Expires: 1978-01-20
Abstract
No abstract record available.
Inventors
- 👤 Francis D Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:07
CPC Classifications
F; F23; F23B; F23B10/00; F23B50/00; F23B50/02; F23B50/04; F23H; F23H13/00; F23H13/06; F23H17/00; F23H17/12; F23B2700/00; F23B2700/011
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2524868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |