Patent US2421444A successfully refreshed from Google Patents.
US2421444A
Expired / Lapsed
US
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Bobbin-wound coil
Assignee: Allied Control Co Inc
•
Filing: 1944-08-05
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Granted: 1947-06-03
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Expires: 1964-08-05
Abstract
No abstract record available.
Inventors
- 👤 Gertrude H Tyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:00
CPC Classifications
H; H01; H01F; H01F5/00; H01F5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1132297A
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CH90578A
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GB305694A
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US1752866A
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US1815212A
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US1939808A
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US1956881A
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GB406279A
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US2184272A
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US2266925A
Cited
US2241761A
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US2275967A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |