Patent US5419774A successfully refreshed from Google Patents.
US3401347A
Expired / Lapsed
US
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Microwave semiconductor amplifier
Assignee: NTT Inc
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Filing: 1967-04-19
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Granted: 1968-09-10
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Expires: 1987-04-19
Abstract
No abstract record available.
Inventors
- 👤 Sumi Masao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:10
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54; H03F3/55; H10; H10N; H10N70/00; H10N70/10; H10N80/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2760013A
Cited
US3008089A
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US3092782A
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US3200354A
Cited
US3173102A
Cited
US3270241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |