US2781433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-magnetic circuit breaker
Assignee: Heinemann Electric Co
•
Filing: 1950-12-23
•
Granted: 1957-02-12
•
Expires: 1970-12-23
Abstract
No abstract record available.
Inventors
- 👤 Kurt W Wilckens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:07
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/14; H01H71/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1440879A
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US1330094A
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US1561386A
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FR561904A
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US1608872A
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US1655847A
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US1968971A
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US1960402A
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US1901708A
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US1985033A
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US2360922A
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US2347018A
Cited
GB578611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-12 | 1960-08-13 | 1961-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-12 | 1964-08-13 | 1965-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-12 | 1968-08-13 | 1969-02-12 | $7700.00 | Window Closed / Lapsed |