US2925636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skull type furnace
Assignee: Crucible Steel Company of America
•
Filing: 1956-07-17
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Granted: 1960-02-23
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Expires: 1976-07-17
Abstract
No abstract record available.
Inventors
- 👤 Paul F Darby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:13
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; F27B14/10; C; C22; C22B; C22B4/00; F27B14/06; F27B5/00; F27B5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-22 | 1963-08-24 | 1964-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-22 | 1967-08-24 | 1968-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-22 | 1971-08-24 | 1972-02-23 | $7700.00 | Window Closed / Lapsed |