Patent US6758851B2 successfully refreshed from Google Patents.
US2747021A
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US
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Telecommunication systems embodying automatic exchanges
Assignee: The General Electric Company PLC
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Filing: 1951-09-18
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Granted: 1956-05-22
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Expires: 1971-09-18
Abstract
No abstract record available.
Inventors
- 👤 Chubb Alexander Albert
- 👤 Levy Maurice Moise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:04
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2203557A
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US2261370A
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US2293588A
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US2379715A
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US2584987A
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US2506613A
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US2570274A
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US2559603A
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US2619548A
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US2590833A
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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) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |