US3489875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for induction heating of slabs
Assignee: Park Ohio Holdings Corp
•
Filing: 1968-07-22
•
Granted: 1970-01-13
•
Expires: 1988-07-22
Abstract
No abstract record available.
Inventors
- 👤 Nicholas V Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:45
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2291862A
Cited
US2676234A
Cited
US2725450A
Cited
US2876325A
Cited
US3249406A
Cited
US3279774A
Cited
US3400009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |