Patent US3516021A successfully refreshed from Google Patents.
US3516021A
Expired / Lapsed
US
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Field effect transistor microwave generator
Assignee: International Business Machines Corp
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Filing: 1967-12-05
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Granted: 1970-06-02
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Expires: 1987-12-05
Abstract
No abstract record available.
Inventors
- 👤 Gerhard Kohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:19
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1841; H03B5/1847; H03B5/1852; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3290613A
Cited
US3378738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |