Patent US1411478A successfully refreshed from Google Patents.
US1411478A
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US
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Electromechanical switching system
Assignee: AT&T Inc
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Filing: 1914-05-25
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Granted: 1922-04-04
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Expires: 1934-05-25
Abstract
No abstract record available.
Inventors
- 👤 Isaac D Budd
- 👤 Claude I Cronburg
- 👤 Freeman S Hurd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:04
CPC Classifications
H; H01; H01H; H01H67/00; H01H67/02; H01H67/04; H01H67/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1925-04-03 | 1925-10-03 | 1926-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-04-03 | 1929-10-03 | 1930-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-04-03 | 1933-10-03 | 1934-04-04 | $7700.00 | Window Closed / Lapsed |