Patent US4729053A successfully refreshed from Google Patents.
US4729053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a lightning arrester and products produced thereby
Assignee: ABB Participation AG
•
Filing: 1985-12-16
•
Granted: 1988-03-01
•
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 07:15
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.
References Cited (Backward Citations)
DE896386C
Cited
US3753198A
Cited
US3806765A
Cited
DE2338355A1
Cited
DE2620245A1
Cited
DE2526137A1
Cited
US4069465A
Cited
US4092694A
Cited
US4364021A
Cited
US4262318A
Cited
EP0004349A1
Cited
US4377541A
Cited
US4450426A
Cited
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 |