Patent US2576785A successfully refreshed from Google Patents.
US2576785A
Expired / Lapsed
US
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Crossbar switch for automatic telephone installations
Assignee: Hartford National Bank and Trust Co
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Filing: 1949-02-12
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Granted: 1951-11-27
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Expires: 1969-02-12
Abstract
No abstract record available.
Inventors
- 👤 Donkelaar Jacobus Johannes
- 👤 Knos Gunnar Borge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:43
CPC Classifications
H; H01; H01H; H01H67/00; H01H67/22; H01H67/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |