US3558991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breaker with high speed tripping system
Assignee: ABB Inc USA
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Filing: 1968-08-30
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Granted: 1971-01-26
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Expires: 1988-08-30
Abstract
Abstract A HIGH SPEED TRIPPING SYSTEM FOR A CIRCUIT BREAKER PARTICULARLY USEFUL FOR CURRENT LIMITING APPLICATIONS DURING A SHORT CIRCUIT INTERRUPTION. THE TRIPPING SYSTEM INCLUDES AN ELECTRONIC SENSING SUBSYSTEM WHICH RAPIDLY SENSES THE OCCURRENCE OF SHORT CIRCUIT FAULTS AND ENERGIZES AN IMPULSE COIL IN RESPONSE THERETO WHICH IN TURN ROTATES A BREAK-AWAY LATCH TO PERMIT THE MOVABLE CONTACT ARM OF THE BREAKER TO RAPIDLY ROTATE TO ITS OPEN CIRCUIT POSITION FREE OF THE RELATIVELY HIGH MASS RESTRAINING AND/OR CLOSING MECHANISM NORMALLY ASSOCIATED THEREWITH.
Inventors
- 👤 Thomas P Brandt Jr
- 👤 Frank J Pokorny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:47
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/50; H01H71/505; H01H2071/506; H01H71/12; H01H71/123; H01H71/125; H01H83/00; H01H83/20
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |