US2998491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Narrow-band telephony system
Assignee: Individual
•
Filing: 1955-02-24
•
Granted: 1961-08-29
•
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 16:20
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/68
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1666206A
Cited
US1747160A
Cited
US2220689A
Cited
US2117739A
Cited
US2176526A
Cited
US2246184A
Cited
US2309705A
Cited
US2340364A
Cited
US2599964A
Cited
US2660708A
Cited
US2761105A
Cited
US2874222A
Cited
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 |