Patent US2998491A successfully refreshed from Google Patents.
US2998491A
Expired / Lapsed
US
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Narrow-band telephony system
Assignee: Individual
•
Filing: 1955-02-24
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Granted: 1961-08-29
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Expires: 1975-02-24
Abstract
No abstract record available.
Inventors
- 👤 Pierre C Marcon
- 👤 Jacques L Daguet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:49
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1747160A
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US2220689A
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US2117739A
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US2176526A
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US2246184A
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US2309705A
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US2340364A
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US2599964A
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US2660708A
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US2761105A
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US2874222A
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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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |