US2704791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-pull amplifier circuit
Assignee: AT&T Inc
•
Filing: 1949-04-29
•
Granted: 1955-03-22
•
Expires: 1969-04-29
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:20
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/26; H03F3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1924469A
Cited
FR791120A
Cited
US2202506A
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US2240635A
Cited
US2276565A
Cited
US2516672A
Cited
US2460907A
Cited
US2485369A
Cited
US2477074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-21 | 1958-09-20 | 1959-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-21 | 1962-09-20 | 1963-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-21 | 1966-09-20 | 1967-03-22 | $7700.00 | Window Closed / Lapsed |