Patent US4143256A successfully refreshed from Google Patents.
US4143256A
Expired / Lapsed
US
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Arc chute having plates coated with weld deterent material
Assignee: General Electric Co
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Filing: 1977-03-17
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Granted: 1979-03-06
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Expires: 1997-03-17
Abstract
Abstract An arc chute for assisting in the extinction of an arc drawn between circuit interrupting contacts opening in air includes a stack of closely spaced metallic plates coated with a weld deterent material, such as silicone varnish. By virtue of this coating, the propensity of metal particles condensed from the metal vapor generated by the arc to weld to the arc plate surfaces is reduced. Consequently, material degradation of the arc chute dielectric strength is avoided, and arc reignition is discouraged.
Inventors
- 👤 Ronald D. Ciarcia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:31
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/30; H01H9/34; H01H9/36
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
An arc chute for utilization in a circuit interrupting device to extinguish an arc created during a circuit interruption, said arc chute comprising, in combination: A. a plurality of metallic arc plates; B. insulative means mounting said arc plates in closely spaced, parallel relation; and C. a high temperature resistance, weld deterent, exterior coating completely covering all exposed surfaces of said arc plates, said coating being sufficiently thin to permit arc penetration thereof and cooling of the arc by said metallic arc plates.
Claim 2
Dependent Claim
83 words
An arc chute for utilization in a circuit interrupting device to extinguish an arc created during a circuit interruption, said arc chute comprising, in combination: A. a plurality of metallic arc plates; B. insulative means mounting said arc plates in closely spaced, parallel relation; and C. a high temperature resistance, weld deterent, exterior coating completely covering all exposed surfaces of said arc plates, said coating being sufficiently thin to permit arc penetration thereof and cooling of the arc by said metallic arc plates.
Claim 3
Dependent Claim
29 words
The arc chute defined in claim 1, wherein said insulative mounting means includes a pair of sideplates, and said coating also completely covers all exposed surfaces of said sideplates.
Claim 4
Dependent Claim
13 words
The arc chute defined in claim 7, wherein said coating is silicone varnish.
Claim 5
Dependent Claim
12 words
The arc chute defined in claim 1, wherein said coating is tetrafluoroethylene.
Claim 6
Dependent Claim
23 words
The arc chute defined in claim 1, wherein said arc plates are formed of steel, and said coating is an iron oxide film.
Claim 7
Dependent Claim
13 words
The arc chute defined in claim 2, wherein said coating is silicone varnish.
Claim 8
Dependent Claim
18 words
The arc chute defined in claim 1, wherein said coating is on the order of 3 mils thick.
References Cited (Backward Citations)
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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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |