US3057937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric arc furnaces
Assignee: Zirconal Processes Ltd
•
Filing: 1957-12-03
•
Granted: 1962-10-09
•
Expires: 1977-12-03
Abstract
No abstract record available.
Inventors
- 👤 Shaw Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:49
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/08; H; H05; H05B; H05B7/00; H05B7/18; H05B7/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US54204A
Cited
US1201224A
Cited
US1201225A
Cited
US1418773A
Cited
US1531811A
Cited
US2224982A
Cited
US2438559A
Cited
US2536859A
Cited
GB716394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |