Patent US2889438A successfully refreshed from Google Patents.
US2889438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency inductor
Assignee: Ohio Crankshaft Co
•
Filing: 1957-06-25
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Granted: 1959-06-02
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Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 Wayne J Mcdanels
- 👤 Centers William Truman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:33
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/362; C; C21; C21D; C21D9/00; C21D9/30; Y; Y02; Y02P; Y02P10/00; Y02P10/25
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) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |