US2544719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic circuit breaker
Assignee: John B. Pierce Laboratory
•
Filing: 1945-08-22
•
Granted: 1951-03-13
•
Expires: 1965-08-22
Abstract
No abstract record available.
Inventors
- 👤 Joseph F O'brien
- 👤 Earl S Boynton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:02
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/02; H01H51/04; H01H51/12; H01H50/00; H01H50/54; H01H50/541
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1337469A
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US1571401A
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US1883766A
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US1918798A
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US2000136A
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DE609420C
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FR818454A
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US2289086A
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US2279395A
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US2335888A
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US2358357A
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US2417438A
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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) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |