US2820155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative impedance bistable signaloperated switch
Assignee: AT&T Inc
•
Filing: 1955-03-09
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Granted: 1958-01-14
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Expires: 1975-03-09
Abstract
No abstract record available.
Inventors
- 👤 John G Linvill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:14
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H03K17/6207; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/313
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2655609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |