Patent US3908109A successfully refreshed from Google Patents.
US3019352A
Expired / Lapsed
US
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Tetrode transistor circuit
Assignee: Zenith Electronics LLC
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Filing: 1958-12-16
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Granted: 1962-01-30
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Expires: 1978-12-16
Abstract
No abstract record available.
Inventors
- 👤 Wertwijn George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:16
CPC Classifications
H; H10; H10D; H10D10/00; H03; H03F; H03F99/00; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-29 | 1965-07-31 | 1966-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-29 | 1969-07-31 | 1970-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-29 | 1973-07-31 | 1974-01-30 | $7700.00 | Window Closed / Lapsed |