US2741690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric induction heating plant and a method of connecting it to a threephase network
Assignee: Otto Junker GmbH
•
Filing: 1952-09-04
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Granted: 1956-04-10
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Expires: 1972-09-04
Abstract
No abstract record available.
Inventors
- 👤 Junker Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:53
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/06; H05B6/08; H05B6/22; H05B6/24
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |