US2931863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic electronic telephone system
Assignee: General Telephone Laboratories Inc
•
Filing: 1955-08-23
•
Granted: 1960-04-05
•
Expires: 1975-08-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Faulkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:38
CPC Classifications
H; H04; H04J; H04J3/00; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2352634A
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US2619548A
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US2773934A
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US2761903A
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US2727094A
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US2694750A
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US2754367A
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US2773935A
Cited
US2836658A
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US2644897A
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US2772370A
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US2830125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |