Patent US2989649A successfully refreshed from Google Patents.
US2989649A
Expired / Lapsed
US
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Low frequency oscillator
Assignee: Collins Radio Co
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Filing: 1957-11-25
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Granted: 1961-06-20
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Expires: 1977-11-25
Abstract
No abstract record available.
Inventors
- 👤 Jack D Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:00
CPC Classifications
H; H03; H03B; H03B19/00; H03B19/03; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB412235A
Cited
US1968576A
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US2766420A
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US2717965A
Cited
US2899568A
Cited
US2747109A
Cited
US2830197A
Cited
US2830198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |