US3393348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overvoltage protector device for induction heating installation
Assignee: Park Ohio Holdings Corp
•
Filing: 1965-07-19
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Granted: 1968-07-16
•
Expires: 1985-07-19
Abstract
No abstract record available.
Inventors
- 👤 Cecil P Porterfield
- 👤 Gary W Vest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/20; H02H7/00; H02H7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |