US2708236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave amplifiers
Assignee: AT&T Inc
•
Filing: 1950-03-18
•
Granted: 1955-05-10
•
Expires: 1970-03-18
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:08
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04; H01J; H01J23/00; H01J23/16; H01J23/24; H01J25/00; H01J25/34; H01J25/36; H01J25/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2122538A
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US2197338A
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US2190511A
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US2280824A
Cited
USRE22990E
Cited
FR890924A
Cited
US2438119A
Cited
US2615141A
Cited
US2516944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-09 | 1958-11-08 | 1959-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-09 | 1962-11-08 | 1963-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-09 | 1966-11-08 | 1967-05-10 | $7700.00 | Window Closed / Lapsed |