US4123682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold cathode gas-discharge tube
Assignee: Siemens AG
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Filing: 1975-09-08
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Granted: 1978-10-31
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Expires: 1995-09-08
Abstract
Abstract A gas-discharge tube especially adapted for use as an over-voltage arrestor containing a radioactive material for pre-ionizing the gas filling is provided in which a radioactive material is applied to at least a portion of the surface of a pair of spaced electrodes located in the tube.
Inventors
- 👤 Gerhard Lange
- 👤 Gerhard Peche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:24
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/20; H01T1/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A surge voltage arrestor comprising: a gas-tight electrical insulating housing; an ionizable gas in said housing; a pair of spaced apart electrodes symmetrically mounted in said gas-tight housing with their frontal surfaces facing each other; a preparation of nickel power containing Nickel 63 radioactive material for pre-ionizing said gas; said radioactive material being adhered to at least a portion of the surface of both of said electrodes; and said nickel powder having a grain size of approximately 8 μm.
Claim 2
Dependent Claim
79 words
A surge voltage arrestor comprising: a gas-tight electrical insulating housing; an ionizable gas in said housing; a pair of spaced apart electrodes symmetrically mounted in said gas-tight housing with their frontal surfaces facing each other; a preparation of nickel power containing Nickel 63 radioactive material for pre-ionizing said gas; said radioactive material being adhered to at least a portion of the surface of both of said electrodes; and said nickel powder having a grain size of approximately 8 μm.
Claim 3
Dependent Claim
21 words
A cold cathode gas-discharge tube according to claim 1, in which said radioactive material is mixed into an electrode activation mass.
Claim 4
Dependent Claim
73 words
A surge voltage arrestor comprising: a gas-filled discharge receptacle having a pair of electrodes disposed therein; said electrodes being spaced apart and facing each other; said electrodes having an electrode activation compound disposed thereon; said electrode activation compound being a radio-active material for the preionization of gas within the receptacle, said radioactive material consisting of nickel powder which contains Nickel 63; and said nickel powder having a grain size of approximately 8 μm.
Claim 5
Dependent Claim
73 words
A surge voltage arrestor comprising: a gas-filled discharge receptacle having a pair of electrodes disposed therein; said electrodes being spaced apart and facing each other; said electrodes having an electrode activation compound disposed thereon; said electrode activation compound being a radio-active material for the preionization of gas within the receptacle, said radioactive material consisting of nickel powder which contains Nickel 63; and said nickel powder having a grain size of approximately 8 μm.
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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |