US2658112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical signaling system
Assignee: Automatic Telephone and Electric Co Ltd
•
Filing: 1950-04-12
•
Granted: 1953-11-03
•
Expires: 1970-04-12
Abstract
No abstract record available.
Inventors
- 👤 Davison Alan
- 👤 Threadgold Ronald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:13
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/446; H04Q1/4465
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2173427A
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US2237661A
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US2284855A
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US2266541A
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US2316909A
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US2350951A
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US2397337A
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US2457131A
Cited
US2496909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |