Patent US2454498A successfully refreshed from Google Patents.
US2454498A
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Signaling and control system for carrier telephone trunk circuits
Assignee: GEN TELEPHONE CORP
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Filing: 1947-02-20
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Granted: 1948-11-23
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Expires: 1967-02-20
Abstract
No abstract record available.
Inventors
- 👤 Everhard H B Bartelink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:27
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/16; H04J1/14; H04M; H04M3/00; H04M3/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1528011A
Cited
US1688453A
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US1688454A
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US1688452A
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US2231636A
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US2280420A
Cited
US2265056A
Cited
US2425495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |