US2592716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-correcting amplifier
Assignee: AT&T Inc
•
Filing: 1949-03-25
•
Granted: 1952-04-15
•
Expires: 1969-03-25
Abstract
No abstract record available.
Inventors
- 👤 Willard D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:42
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3223
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2153728A
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US2129669A
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US2250934A
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US2375223A
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US2229108A
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US2229090A
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US2229089A
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US2229158A
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US2416790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |