US2669647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual frequency induction heating apparatus
Assignee: GEN ENGINEERING Co CANADA
•
Filing: 1952-06-13
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Granted: 1954-02-16
•
Expires: 1972-06-13
Abstract
No abstract record available.
Inventors
- 👤 Segsworth Robert Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:48
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1900842A
Cited
US1646498A
Cited
US1980875A
Cited
US2202758A
Cited
US2281334A
Cited
US2322777A
Cited
US2604577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |