US3448340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer
Assignee: McGraw Edison Co
•
Filing: 1965-06-29
•
Granted: 1969-06-03
•
Expires: 1985-06-29
Abstract
No abstract record available.
Inventors
- 👤 Herbert D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:10
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/40; H01F27/402
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735979A
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US2340057A
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US2476147A
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US2476139A
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US2597185A
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US2930964A
Cited
US2817794A
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US2962600A
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US3200357A
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US3210706A
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US3360754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |