Patent US2768277A successfully refreshed from Google Patents.
US2768277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric furnace
Assignee: —
•
Filing: —
•
Granted: 1956-10-23
•
Expires: 1973-10-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:59
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/06; F; F27; F27D; F27D11/00; F27D11/08; F27D11/10; H05B3/00; H05B3/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1443581A
Cited
US2147071A
Cited
US688393A
Cited
US812801A
Cited
US1167176A
Cited
US1279146A
Cited
FR622301A
Cited
US1837178A
Cited
US1858062A
Cited
US1981015A
Cited
US2266726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |