US2421148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic relay circuit
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1943-05-22
•
Granted: 1947-05-27
•
Expires: 1963-05-22
Abstract
No abstract record available.
Inventors
- 👤 Hadfield Bertram Morton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:42
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/02; H01H47/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2123063A
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US1693124A
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US1742367A
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US1758255A
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US2001494A
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FR812133A
Cited
US2182637A
Cited
US2299941A
Cited
US2279849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |