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US3519765A
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Bidirectional amplifier
Assignee: SEISCOR Inc
•
Filing: 1967-02-02
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Granted: 1970-07-07
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Expires: 1987-02-02
Abstract
No abstract record available.
Inventors
- 👤 Alvin J Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:40
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2659774A
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US2763832A
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US2733304A
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US3172960A
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US3316487A
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US3289088A
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US3431366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |