US2869845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crucible furnace
Assignee: United States Steel Corp
•
Filing: 1955-10-21
•
Granted: 1959-01-20
•
Expires: 1975-10-21
Abstract
No abstract record available.
Inventors
- 👤 John D Selvaggio
- 👤 Calvin C Wareham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:55
CPC Classifications
F; F27; F27B; F27B14/00; F27B17/00; F27B17/02; F27D; F27D1/00; F27D19/00; F27D99/00; F27D99/0001; F27D99/0033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US648655A
Cited
US824338A
Cited
GB237397A
Cited
GB522800A
Cited
US2345247A
Cited
US2500943A
Cited
US2520133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |