US2550241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crossbar switching device
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1945-06-29
•
Granted: 1951-04-24
•
Expires: 1965-06-29
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Graybill
- 👤 Sengebusch Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:56
CPC Classifications
H; H01; H01H; H01H67/00; H01H67/22; H01H67/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1517425A
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US1528763A
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US1563658A
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US1825414A
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US1954758A
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US2137514A
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US2137503A
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US2322219A
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US2396077A
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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) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |