US2702887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-phase transformer cores
Assignee: McGraw Electric Co
•
Filing: 1950-11-13
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Granted: 1955-02-22
•
Expires: 1970-11-13
Abstract
No abstract record available.
Inventors
- 👤 Joublanc Joseph Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:25
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US400862A
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US422746A
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US564944A
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US1933140A
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US2344294A
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US2431128A
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GB583957A
Cited
US2401952A
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US2400184A
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US2616070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-21 | 1958-08-23 | 1959-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-21 | 1962-08-23 | 1963-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-21 | 1966-08-23 | 1967-02-22 | $7700.00 | Window Closed / Lapsed |