US2988669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave amplifier
Assignee: AT&T Inc
•
Filing: 1958-05-29
•
Granted: 1961-06-13
•
Expires: 1978-05-29
Abstract
No abstract record available.
Inventors
- 👤 Robert J Collier
- 👤 Feinstein Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:47
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2582186A
Cited
US2590511A
Cited
US2651001A
Cited
US2622158A
Cited
US2810854A
Cited
US2808538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |