Patent US2532750A successfully refreshed from Google Patents.
US2532750A
Expired / Lapsed
US
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Calling line identifier having display device at operator's position
Assignee: Automatic Telephone and Electric Co Ltd
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Filing: 1947-06-13
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Granted: 1950-12-05
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Expires: 1967-06-13
Abstract
No abstract record available.
Inventors
- 👤 Baker George Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:37
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/60; H04M3/64; H04M15/00; H04M15/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2077537A
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US2286445A
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US2242285A
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US2270246A
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US2319424A
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US2252766A
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US2341934A
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US2387897A
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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) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |