US2485658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio-frequency power heating apparatus and method
Assignee: Ellis Foster Co
•
Filing: 1945-11-05
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Granted: 1949-10-25
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Expires: 1965-11-05
Abstract
No abstract record available.
Inventors
- 👤 John W Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:26
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1555258A
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US2042145A
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US1959390A
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US2303341A
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US2341617A
Cited
US2231457A
Cited
US2404191A
Cited
US2413003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |