US3136921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breakers
Assignee: Westinghouse Electric Corp
•
Filing: 1957-12-10
•
Granted: 1964-06-09
•
Expires: 1977-12-10
Abstract
No abstract record available.
Inventors
- 👤 Hiller D Dorfman
- 👤 Robert H Flick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:58
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/1045; H01H77/00; H01H77/02; H01H77/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A CIRCUIT INTERRUPTER COMPRISING A CIRCUIT-BREAKER HAVING RELATIVELY MOVABLE CONTACTS AND MEANS RELEASABLE TO EFFECT OPENING OF SAID CIRCUIT-BREAKER CONTACTS, TRIP MEANS AUTOMATICALLY OPERABLE IN RESPONSE TO OVERLOAD CURRENTS TO CAUSE RELEASE OF SAID RELEASABLE MEANS, AND AN ELECTRORESPONSIVE DEVICE HAVING SEPARABLE CONTACTS AUTOMATICALLY OPERABLE ONLY IN RESPONSE TO EXCESSIVE CURRENTS TO DRAW AN ARC IN THE CIRCUIT OF THE BREAKER BEFORE SAID CIRCUIT-BREAKER CONTACTS OPEN AND TO THEREBY REDUCE THE CURRENT THAT SAID CIRCUIT-BREAKER CONTACTS WILL INTERRUPT.
References Cited (Backward Citations)
US1479465A
Cited
GB366966A
Cited
US2177774A
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GB562729A
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US2617861A
Cited
US2828392A
Cited
US2819429A
Cited
US2920164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |