US2665845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor trigger circuit for operating relays
Assignee: AT&T Inc
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Filing: 1952-10-08
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Granted: 1954-01-12
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Expires: 1972-10-08
Abstract
No abstract record available.
Inventors
- 👤 Robert L Trent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:37
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/01; H03K3/012; H03K17/00; H03K17/08; H03K17/081; H03K17/0814; H03K17/08146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |