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US2729771A
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US
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Electric relay systems
Assignee: Automatic Electric Laboratories Inc
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Filing: 1949-01-28
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Granted: 1956-01-03
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Expires: 1969-01-28
Abstract
No abstract record available.
Inventors
- 👤 Bertram M Hadfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:14
CPC Classifications
H; H04; H04Q; H04Q9/00; H04Q9/08; H04Q9/10; H01; H01H; H01H47/00; H01H47/02; H01H47/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1691222A
Cited
US1952369A
Cited
US1982290A
Cited
US2038649A
Cited
US1986921A
Cited
US2512879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |