US4729053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a lightning arrester and products produced thereby
Assignee: ABB Participation AG
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Filing: 1985-12-16
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Granted: 1988-03-01
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Expires: 2005-12-16
Abstract
Abstract A lightning arrester with a monolithic, active resistor core made of voltage-dependent resistance material based on ZnO is produced by mixing and grinding the base materials ZnO+metal oxides, producing pourable granules, filling into a silicone rubber tube and pressing cold-isostatically or radially into a moulding, sintering of the moulding into a self-supporting, monolithic resistor core, converting the resistor core, with an insulator by casting around, coating or painting with an epoxy resin, silicone material or concrete polymer or by drawing over a shrink-fit tube or by glazing. The resultant lightning arrester has a simple configuration, good reproducibility, cost-effective mass production.
Inventors
- 👤 Gunther Maier
- 👤 Joseph Mosele
- 👤 Roger Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:49
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112; H01C7/102; H01C7/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
In a lightning arrester including an active resistor core made of a voltage-dependent resistance material based on ZnO, an insulator jacket, and terminal fittings serving as electrodes for electrical connections, the improvement comprising the active resistor core being a single, compact, monolithic workpiece having a substantially cylindrical shape with a height to diameter ratio greater than one and having a total of only two contact areas at its opposite ends, said ends each including at least one annular groove for improving adhesion with respect to adjacent electrodes.
Claim 2
Dependent Claim
87 words
In a lightning arrester including an active resistor core made of a voltage-dependent resistance material based on ZnO, an insulator jacket, and terminal fittings serving as electrodes for electrical connections, the improvement comprising the active resistor core being a single, compact, monolithic workpiece having a substantially cylindrical shape with a height to diameter ratio greater than one and having a total of only two contact areas at its opposite ends, said ends each including at least one annular groove for improving adhesion with respect to adjacent electrodes.
Claim 3
Dependent Claim
26 words
Lightning arrester according to claim 1, wherein the insulator is a cylindrical jacket selected from the group consisting of cast resin, shrink-fit tubing, paint or glass.
Claim 4
Dependent Claim
62 words
A lightning arrester comprising an active resistor core formed of a voltage-dependent resistance material based upon ZnO formed as a monolithic structure having opposite ends, said opposite ends being formed with annular grooves therein to accept electrode members; first and second terminal electrodes fitted, respectively, to said opposite ends of the monolithic resistor core; and an insulating sheath formed about the core.
Claim 5
Dependent Claim
62 words
A lightning arrester comprising an active resistor core formed of a voltage-dependent resistance material based upon ZnO formed as a monolithic structure having opposite ends, said opposite ends being formed with annular grooves therein to accept electrode members; first and second terminal electrodes fitted, respectively, to said opposite ends of the monolithic resistor core; and an insulating sheath formed about the core.
Claim 6
Dependent Claim
24 words
A lightning arrester in accordance with claim 3 wherein the resistor core has a substantially cylindrical shape with a height-to-diameter ratio greater than one.
Claim 7
Dependent Claim
34 words
A lightning arrester according to claim 3 wherein said insulating sheath has a cylindrical shape and is formed from a material selected from the group consisting of cast resin, shrink-fit resin, paint or glass.
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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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |