US3506907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gating control of a resonant bridge inverter for induction heating use
Assignee: Park Ohio Holdings Corp
•
Filing: 1967-10-04
•
Granted: 1970-04-14
•
Expires: 1987-10-04
Abstract
No abstract record available.
Inventors
- 👤 Cecil P Porterfield
- 👤 Graham R Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:52
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3264548A
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US3133241A
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US3315146A
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US3376493A
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US3260962A
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US3365651A
Cited
US3355653A
Cited
US3333179A
Cited
US3394299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |