US3461397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced differential amplifier with improved longitudinal voltage margin
Assignee: AT&T Inc
•
Filing: 1968-04-18
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Granted: 1969-08-12
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Expires: 1988-04-18
Abstract
No abstract record available.
Inventors
- 👤 Peter B Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:29
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/4508; H03F3/45085; H03F2203/00; H03F2203/45; H03F2203/45392; H03F2203/45496; H03F2203/45594; H03F2203/45636; H03F2203/45696; H03F2203/45702
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3346817A
Cited
US3310688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |