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Patent US3767973A successfully refreshed from Google Patents.
US3767973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielded metal enclosed lightning arrester
Assignee: ABB Inc USA
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Filing: 1972-10-11
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Granted: 1973-10-23
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Expires: 1992-10-11
Abstract
Abstract A high voltage lightning arrester enclosed in a grounded metal enclosure containing a pressurized insulating gas. The arrester is provided with an asymmetrical shield and grading means to control the voltage distribution across the arrester.
Inventors
- 👤 N Osmundsen
- 👤 J Harder
- 👤 T Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:44
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/16; H01T4/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
In combination, a grounded metal enclosure containing an insulating gas, a lightning arrester disposed within said enclosure, said arrester having line terminal means at one end thereof and ground terminal means at the other end, shielding means in conductive relation with the line terminal means, said shielding means extending toward said other end of the arrester on one side Only of the arrester and being of varying length axially of the arrester, and grading means encircling the arrester for controlling the electric field within the arrester.
Claim 2
Dependent Claim
86 words
In combination, a grounded metal enclosure containing an insulating gas, a lightning arrester disposed within said enclosure, said arrester having line terminal means at one end thereof and ground terminal means at the other end, shielding means in conductive relation with the line terminal means, said shielding means extending toward said other end of the arrester on one side Only of the arrester and being of varying length axially of the arrester, and grading means encircling the arrester for controlling the electric field within the arrester.
Claim 3
Dependent Claim
28 words
The combination of claim 1 in which said grading means comprises a series of conductive rings spaced apart and extending for substantially the entire length of the arrester.
Claim 4
Dependent Claim
19 words
The combination of claim 2 in which said shielding means includes a plurality of conducting members of differing lengths.
Claim 5
Dependent Claim
90 words
The combination of claim 2 in which said shielding means includes an arcuate member extending around one side of the arrester adjacent the line terminal means and a plurality of elongated members disposed side by side on the other side of the arrester and forming a complete circle with said arcuate member, said elongated members extending axially of the arrester toward the other end thereof, the central one of the elongated members being of greatest length and the successive members on each side of the central member being progressively shorter.
Claim 6
Dependent Claim
17 words
The combination of claim 4 in which said elongated members are metal tubes closed at both ends.
Claim 7
Dependent Claim
51 words
The combination of claim 1 in which said ground terminal means includes a conducting bottom cap having a central opening therein, and means for attaching said cap to the metal enclosure with a sealed connection, the enclosure having an opening adjacent said opening in the cap and within the sealed connection.
Claim 8
Dependent Claim
80 words
A lightning arrester adapted for use in a gas-filled, grounded metal enclosure, said arrester comprising a housing having line terminal means at one end thereof and ground terminal means at the other end thereof, asymmetrical shielding means extending axially of the arrester on one side only, grading means encircling the arrester within the shielding means, said terminal means including a conducting member for supporting said shielding means, said conducting member having contact means thereon for engaging a rigid, rod-like conductor.
Claim 9
Dependent Claim
80 words
A lightning arrester adapted for use in a gas-filled, grounded metal enclosure, said arrester comprising a housing having line terminal means at one end thereof and ground terminal means at the other end thereof, asymmetrical shielding means extending axially of the arrester on one side only, grading means encircling the arrester within the shielding means, said terminal means including a conducting member for supporting said shielding means, said conducting member having contact means thereon for engaging a rigid, rod-like conductor.
Claim 10
Dependent Claim
74 words
A lightning arrester as defined in claim 7 in which said shielding means includes an arcuate member mounted on said conducting member at one side of the arrester and a plurality of elongated members mounted side by side on the conducting member at the other side of the arrester, said elongated members forming a complete circle with the arcuate member, and the elongated members extending axially of the arrester and being of different lengths.
Claim 11
Dependent Claim
37 words
A lightning arrester as defined in claim 7 in which said grading means comprises a plurality of conducting rings and means for supporting said rings in spaced relation from one end of the arrester to the other.
Claim 12
Dependent Claim
34 words
A lightning arrester as defined in claim 9 in which said shielding means includes a plurality of elongated members of varying length mounted on said conducting member at one side only of the arrester.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |