US3428899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective communication system wherein fach information pulse is address coded for transmission on a selected idle carrier frequency
Assignee: NEC Corp
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Filing: 1965-10-29
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Granted: 1969-02-18
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Expires: 1985-10-29
Abstract
No abstract record available.
Inventors
- 👤 Tadahiro Sekimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/18; H04W88/185; H04W88/187; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/50; H04J; H04J1/00; H04J1/02; H04J1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |