US4091436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knob type surge voltage arrester
Assignee: Siemens AG
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Filing: 1976-10-26
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Granted: 1978-05-23
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Expires: 1996-10-26
Abstract
Abstract A knob type surge voltage arrester has electrodes with conical or semi-circular shape. A coating consisting of electrically conductive material (an ignition aid) is provided on the insulating member. The conductive coating on the insulating body is positioned at a level corresponding to the center of the discharge path defined by active electrode surfaces of the electrodes. The spacing of the active electrode surfaces from one another is smaller than the spacing of the active electrode surfaces relative to the coating.
Inventors
- 👤 Gerhard Lange
- 👤 Gerhard Peche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:23
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
185 words
In a knob type surge voltage arrester formed as a gas-filled housing with curve-shaped electrodes opposite one another inserted in ends of a tube-shaped insulating member of the housing, convex curvature portions of the electrodes which face each other forming active arcing surfaces of the electrodes, a coating of electrically conductive ignition material being coated over a part of the interior of the insulating member, the improvement which comprises coating the electrically conductive material on the interior of the insulating member at a level corresponding to the center of a discharge path defined by the active surfaces of the electrodes, the conductive material extending substantially parallel to a center axis substantially only between said active arcing surfaces and being shaped such that the spacing of the active surfaces of the electrodes from one another is smaller than the spacing of the active surfaces of either of the electrodes from the coating of electrically conductive material, and the conductive material extending on the insulating member as a narrow strip in a circular path for a given arc about the center axis of the surge voltage arrester.
Claim 2
Dependent Claim
185 words
In a knob type surge voltage arrester formed as a gas-filled housing with curve-shaped electrodes opposite one another inserted in ends of a tube-shaped insulating member of the housing, convex curvature portions of the electrodes which face each other forming active arcing surfaces of the electrodes, a coating of electrically conductive ignition material being coated over a part of the interior of the insulating member, the improvement which comprises coating the electrically conductive material on the interior of the insulating member at a level corresponding to the center of a discharge path defined by the active surfaces of the electrodes, the conductive material extending substantially parallel to a center axis substantially only between said active arcing surfaces and being shaped such that the spacing of the active surfaces of the electrodes from one another is smaller than the spacing of the active surfaces of either of the electrodes from the coating of electrically conductive material, and the conductive material extending on the insulating member as a narrow strip in a circular path for a given arc about the center axis of the surge voltage arrester.
Claim 3
Dependent Claim
19 words
The knob type surge voltage arrester according to claim 1, characterized in that the insulating member consists of glass.
Claim 4
Dependent Claim
31 words
The knob type surge voltage arrester according to claim 1, characterized in that the coating of electrically conductive material consists of a mixture of low-melting glass solder and a graphite suspension.
Claim 5
Dependent Claim
22 words
The knob type surge voltage arrester according to claim 1, characterized in that the coating of electrically conductive material is radioactively doped.
Claim 6
Dependent Claim
16 words
The knob type surge voltage arrester of claim 1 in which the curve-shaped electrodes are semi-circular.
Claim 7
Dependent Claim
16 words
The knob type surge voltage arrester of claim 1 in which the curve-shaped electrodes are conical.
Claim 8
Dependent Claim
16 words
The knob type surge voltage arrester of claim 1 which the insulating member consists of ceramic.
Claim 9
Dependent Claim
147 words
A knob type surge voltage arrester comprising: (a) a tube-shaped insulating member; (b) opposite facing curve-shaped inwardly extending electrodes sealed at opposite ends of the insulating member, an active convex discharge surface of each electrode being created at a convex curved portion of the opposite facing electrodes which are in closest approach to each other; (c) a gas sealed within said insulating member; (d) a coating of electrically conductive material on the interior of the insulating member at a level corresponding to the center of a discharge path defined between the active discharge surfaces of the electrodes, said coating extending substantially only between the closest approach active discharge surfaces of the electrodes, the conductive material being shaped such that the spacing of the active surfaces from one another is smaller than the spacing of the active surfaces of the electrodes from the coating of electrically conductive material.
Claim 10
Dependent Claim
147 words
A knob type surge voltage arrester comprising: (a) a tube-shaped insulating member; (b) opposite facing curve-shaped inwardly extending electrodes sealed at opposite ends of the insulating member, an active convex discharge surface of each electrode being created at a convex curved portion of the opposite facing electrodes which are in closest approach to each other; (c) a gas sealed within said insulating member; (d) a coating of electrically conductive material on the interior of the insulating member at a level corresponding to the center of a discharge path defined between the active discharge surfaces of the electrodes, said coating extending substantially only between the closest approach active discharge surfaces of the electrodes, the conductive material being shaped such that the spacing of the active surfaces from one another is smaller than the spacing of the active surfaces of the electrodes from the coating of electrically conductive material.
Claim 11
Dependent Claim
37 words
The knob type surge voltage arrester of claim 8 in which the distance between the electrodes is smaller than the distance from one electrode to the coating plus the distance from the other electrode to the coating.
Claim 12
Dependent Claim
26 words
The knob type surge voltage arrester of claim 8 in which the distance between electrodes is smaller than the distance from either electrode to the coating.
Claim 13
Dependent Claim
176 words
In a knob type surge voltage arrester formed as a gas-filled housing with curve-shaped electrodes opposite one another inserted in ends of a tube-shaped insulating member of the housing, convex curvature portions of the electrodes which face each other forming active arcing surfaces of the electrodes, a coating of electrically conductive ignition material being coated over a part of the interior of the insulating member, the improvement which comprises coating the electrically conductive material on the interior of the insulating member at a level corresponding to the center of a discharge path defined by the active surfaces of the electrodes, the conductive material extending substantially parallel to a center axis substantially only between said active arcing surfaces and being shaped such that the spacing of the active surfaces of the electrodes from one another is smaller than the spacing of the active surfaces of either of the electrodes from the coating of electrically conductive material, and the coating of electrically conductive material being applied to the insulating member in the form of at least one dot.
Claim 14
Dependent Claim
176 words
In a knob type surge voltage arrester formed as a gas-filled housing with curve-shaped electrodes opposite one another inserted in ends of a tube-shaped insulating member of the housing, convex curvature portions of the electrodes which face each other forming active arcing surfaces of the electrodes, a coating of electrically conductive ignition material being coated over a part of the interior of the insulating member, the improvement which comprises coating the electrically conductive material on the interior of the insulating member at a level corresponding to the center of a discharge path defined by the active surfaces of the electrodes, the conductive material extending substantially parallel to a center axis substantially only between said active arcing surfaces and being shaped such that the spacing of the active surfaces of the electrodes from one another is smaller than the spacing of the active surfaces of either of the electrodes from the coating of electrically conductive material, and the coating of electrically conductive material being applied to the insulating member in the form of at least one dot.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |