US4797522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-type circuit interrupter
Assignee: Westinghouse Electric Corp
•
Filing: 1988-02-11
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Granted: 1989-01-10
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Expires: 2008-02-11
Abstract
Abstract A vacuum circuit interrupter comprising an insulated, evacuated, cylindrical housing for a stationary electrode and a movable electrode, with an arc shield provided with a predetermined spacing from and connected to the stationary electrode. The dimensions of the electrodes are asymmetrical with the movable electrode being smaller.
Inventors
- 👤 Roy E. Voshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:02
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/662; H01H33/66261; H01H2033/66269
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A vacuum circuit interrupter comprising (a) an insulated cylindrical evacuated housing; (b) a stationary electrode in said housing; (c) a movable electrode in said housing adapted to engage said stationary electrode so as to provide an arc on separation; (d) an arc shield surrounding the stationary electrode and electrically connected thereto extending toward the movable electrode to provide a predetermined spacing between the arc shield and the movable electrode; and (e) in which the movable electrode is of a smaller dimension with respect to the stationary electrode so as to form asymmetric shaped electrode structures, whereby to provide the predetermined spacing between the arc shield and the movable electrode.
Claim 2
Dependent Claim
109 words
A vacuum circuit interrupter comprising (a) an insulated cylindrical evacuated housing; (b) a stationary electrode in said housing; (c) a movable electrode in said housing adapted to engage said stationary electrode so as to provide an arc on separation; (d) an arc shield surrounding the stationary electrode and electrically connected thereto extending toward the movable electrode to provide a predetermined spacing between the arc shield and the movable electrode; and (e) in which the movable electrode is of a smaller dimension with respect to the stationary electrode so as to form asymmetric shaped electrode structures, whereby to provide the predetermined spacing between the arc shield and the movable electrode.
Claim 3
Dependent Claim
22 words
A vacuum circuit interrupter as claimed in claim 1, in which the arc shield and the electrodes are of the same material.
Claim 4
Dependent Claim
44 words
A vacuum circuit interrupter as claimed in claim 2, in which the open end of the arc shield is curved inwardly so as to prevent the erosion and arc metal vapors from the electrodes from depositing on inner surface of said insulated cylindrical housing.
Claim 5
Dependent Claim
38 words
A vacuum circuit interrupter as claimed in claim 1, 2, or 3, in which the electrode surfaces are formed with slots so as to produce a magnetic drive on the resulting arc caused by the electrodes on separation.
References Cited (Backward Citations)
US3720798A
Cited
US3705281A
Cited
US3836740A
Cited
US3996437A
Cited
US3997748A
Cited
US4210790A
Cited
US4171474A
Cited
US4345126A
Cited
US4394554A
Cited
US4481390A
Cited
US4414448A
Cited
US4431885A
Cited
US4408107A
Cited
US4471184A
Cited
US4542266A
Cited
US4661666A
Cited
US4743718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |