US3040267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative resistance amplifier circuits
Assignee: AT&T Inc
•
Filing: 1959-06-22
•
Granted: 1962-06-19
•
Expires: 1979-06-22
Abstract
No abstract record available.
Inventors
- 👤 Seidel Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:55
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/04; H03F2200/00; H03F2200/372
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2719223A
Cited
US2522395A
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US2585571A
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US2666816A
Cited
US2752559A
Cited
US2652501A
Cited
US2737601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |