Patent US2997704A successfully refreshed from Google Patents.
US2997704A
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Signal conversion apparatus
Assignee: Epsco Inc
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Filing: 1958-02-24
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Granted: 1961-08-22
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Expires: 1978-02-24
Abstract
No abstract record available.
Inventors
- 👤 Bernard M Gordon
- 👤 Evan T Colton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:46
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/1205; H03M1/123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2762038A
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US2869115A
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US2784396A
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US2839740A
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US2834011A
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US2827233A
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US2858434A
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US2839744A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |