Patent DE567999C successfully refreshed from Google Patents.
US2910541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-division multiplex communication systems
Assignee: Post Office
•
Filing: 1953-11-09
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Granted: 1959-10-27
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Expires: 1973-11-09
Abstract
No abstract record available.
Inventors
- 👤 Harris Lionel Roy Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:12
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04J; H04J3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2547001A
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US2649505A
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US2638505A
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US2619548A
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US2577141A
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US2773934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |