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US3457373A
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Automatic channel switching device for multi-channel binary code telecommunication system
Assignee: POSTERIJEN TELEGRAFIE EN TELEF
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Filing: 1965-09-22
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Granted: 1969-07-22
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Expires: 1985-09-22
Abstract
No abstract record available.
Inventors
- 👤 Hendrik Cornelis Anthon Duuren
- 👤 Herman Da Silva
- 👤 Wilhelm Frederik Brok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:24
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3042752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |