US2776380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical circuits employing magnetic cores
Assignee: AT&T Inc
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Filing: 1954-04-27
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Granted: 1957-01-01
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Expires: 1974-04-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Frederick T Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:44
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26; F02C7/268; F02C7/275; F02C7/277; G; G06; G06F; G06F7/00; G06F7/38; G06F7/383; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; G11C11/06078; H; H03; H03K; H03K19/00; H03K19/02; H03K19/16; H03K3/00; H03K3/02; H03K3/45
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2640164A
Cited
US2666151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |