US3818259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-filled discharge tube for transient protection purposes
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1973-02-23
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Granted: 1974-06-18
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Expires: 1993-02-23
Abstract
Abstract A gas-filled discharge tube for use as transient protection device has at least two electrodes separated by a discharge gap and one insulating body which provides a vacuum sealed housing for the electrodes. Between the electrodes the insulating body defines a narrow gap in the direction from the discharge gap to the junction between one electrode and the insulating body around the whole electrode. This narrow gap has a maximum width of 0.15 mm along a distance which has a length of at least 1 mm.
Inventors
- 👤 Jensen C Schleimann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:54
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/10; H01T4/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A gas-filled discharge device for transient protection comprising, at least two symmetrical electrodes having face surfaces, an insulation housing mechanically connected to said electrodes for supporting said electrodes in a vacuum-tight housing such that the face surfaces of said electrodes are opposite each other across a discharge gap in plane perpendicular to the symmetry axis of the electrodes, said housing and said electrodes being so dimensioned that an annular gap exists between each said electrode and said housing in the region of their mechanical connection, said annular gap having a length of at least 1 mm and a thickness of less than 0.15 mm, and an ionizable gas within said housing.
Claim 2
Dependent Claim
111 words
A gas-filled discharge device for transient protection comprising, at least two symmetrical electrodes having face surfaces, an insulation housing mechanically connected to said electrodes for supporting said electrodes in a vacuum-tight housing such that the face surfaces of said electrodes are opposite each other across a discharge gap in plane perpendicular to the symmetry axis of the electrodes, said housing and said electrodes being so dimensioned that an annular gap exists between each said electrode and said housing in the region of their mechanical connection, said annular gap having a length of at least 1 mm and a thickness of less than 0.15 mm, and an ionizable gas within said housing.
Claim 3
Dependent Claim
18 words
The discharge device of claim 1 wherein the thickness of said annular gap is less than 0.1 mm.
Claim 4
Dependent Claim
22 words
The discharge gap of claim 1 wherein the thickness of said annular gap gradually increases in the direction away from said junction.
Claim 5
Dependent Claim
126 words
A gas-filled discharge device for transitent protection comprising, at least two symmetrical electrodes having face surfaces, an insulation housing mechanically connected to said electrodes for supporting said electrodes in a vacuum-tight housing such that the face surfaces of said electrodes are opposite each other across a discharge gap in plane perpendicular to the symmetry axis of the electrodes, said housing and said electrodes being so dimensioned that an annular gap exists between each said electrode and said housing in the region of their mechanical connection, said annular gap having a length of at least 1 mm and a thickness of less than 0.15 mm, the face surface of at least one of said electrodes being provided with a cavity, and an ionizable gas within said housing.
Claim 6
Dependent Claim
126 words
A gas-filled discharge device for transitent protection comprising, at least two symmetrical electrodes having face surfaces, an insulation housing mechanically connected to said electrodes for supporting said electrodes in a vacuum-tight housing such that the face surfaces of said electrodes are opposite each other across a discharge gap in plane perpendicular to the symmetry axis of the electrodes, said housing and said electrodes being so dimensioned that an annular gap exists between each said electrode and said housing in the region of their mechanical connection, said annular gap having a length of at least 1 mm and a thickness of less than 0.15 mm, the face surface of at least one of said electrodes being provided with a cavity, and an ionizable gas within said housing.
Claim 7
Dependent Claim
13 words
The discharge device of claim 4 wherein said cavity is cylindrical in shape.
Claim 8
Dependent Claim
14 words
The discharge device of claim 4 wherein said cavity is partially spherical in shape.
Claim 9
Dependent Claim
14 words
The discharge device of claim 4 wherein said cavity is generally conical in shape.
Claim 10
Dependent Claim
14 words
The discharge device of claim 4 wherein said cavity is stepped conical in shape.
References Cited (Backward Citations)
US3454811A
Cited
US3702952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |