US2744946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric furnace and heating unit therefor
Assignee: L AND L Manufacturing CO
•
Filing: 1953-11-25
•
Granted: 1956-05-08
•
Expires: 1973-11-25
Abstract
No abstract record available.
Inventors
- 👤 Lewicki Stephen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:50
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; H05B3/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1533228A
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US1489843A
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US1763239A
Cited
US1597900A
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US1647346A
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US1709340A
Cited
DE594498C
Cited
US2255518A
Cited
US2417953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |