US2557388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone system employing finder switches for connecting calling lines tonumerical switches
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1947-05-28
•
Granted: 1951-06-19
•
Expires: 1967-05-28
Abstract
No abstract record available.
Inventors
- 👤 Molnar Imre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:52
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1309248A
Cited
US2377544A
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US1632025A
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US1747478A
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US1950877A
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US1871300A
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US1891423A
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US2036055A
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US2077537A
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US2131568A
Cited
US2131572A
Cited
US2200820A
Cited
US2258651A
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US2271878A
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US2424577A
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US2409063A
Cited
US2337365A
Cited
US2377314A
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US2332290A
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US2339669A
Cited
US2383541A
Cited
US2479276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |