Patent US2689296A successfully refreshed from Google Patents.
US2689296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method of high-frequency induction heating
Assignee: Ohio Crankshaft Co
•
Filing: 1949-06-09
•
Granted: 1954-09-14
•
Expires: 1969-06-09
Abstract
No abstract record available.
Inventors
- 👤 John T Sabol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:15
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/362
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2202758A
Cited
US2182341A
Cited
US2493950A
Cited
US2394944A
Cited
US2477118A
Cited
US2493771A
Cited
GB621081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |