US2871297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
100-line direct-access crossbar telephone switching unit
Assignee: TDK Micronas GmbH
•
Filing: 1954-03-08
•
Granted: 1959-01-27
•
Expires: 1974-03-08
Abstract
No abstract record available.
Inventors
- 👤 Edward J Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:29
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1930522A
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US2613278A
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US2522000A
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US2542999A
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US2559702A
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US2512942A
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US2674657A
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US2668195A
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US2744163A
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US2741663A
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US2747021A
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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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |