US2457434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling system for two-way dialing over radio and carrier telephone circuits
Assignee: GEN TELEPHONE CORP
•
Filing: 1947-02-20
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Granted: 1948-12-28
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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
2026-11-03 13:22
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1528011A
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US1674695A
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US1688453A
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US2061699A
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US2265056A
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US2433281A
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US2305496A
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US2394045A
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US2430471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |