US3742282A
Expired / Lapsed
US
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Electrodes
Assignee: Robert Bosch GmbH
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Filing: 1971-08-03
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Granted: 1973-06-26
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Expires: 1991-08-03
Abstract
Abstract Electrodes particularly adapted for use in gas filled spark gap and discharge containers comprising a material resistant to sputtering and vaporization consisting of at least one nitride of a metal of the group consisting of Hf, Zr and Ta and having an O2 content bound as an oxide or oxynitride of less than 5 weight percent and a content of further impurities of less than 1.5 weight percent.
Inventors
- 👤 G Siegle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:53
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/39; H01J; H01J17/00; H01J17/02; H01J17/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
39 words
Electrode according to claim 1 wherein said material resistant to sputtering and vaporization is applied as a covering layer onto a base material selected from the group consisting of metals and alloys having substantially the same thermal expansion coefficient.
Claim 2
Dependent Claim
45 words
Electrode according to claim 2 having an electrode base material selected from the group consisting of W, Mo, Ta, Ni, Fe-Ni-Cr-alloy, Fe-Ni alloy and steel and contains in part a covering layer of the same materials which form the actual electrode material for the sparks.
Claim 3
Dependent Claim
16 words
Electrode according to claim 2, wherein said covering layer has a thickness of about 0.1-1 mm.
Claim 4
Dependent Claim
36 words
Electrode according to claim 2 wherein said metallic base material is at least in part provided with a covering layer of said materials by plasma-spraying and has an oxygen content of less than 5 weight percent.
Claim 5
Dependent Claim
39 words
Electrode according to claim 1 wherein said material resistant to sputtering and atomizing is soldered onto said coil layer or welded onto a metallic base material or inserted in it in the form of pins or welded small plates.
Claim 6
Dependent Claim
24 words
Electrode according to claim 1 wherein said base material is selected from the group consisting of Mo, Ta, W, Ni, Fe-Ni-Cr-and Fe-Ni- steel alloys.
Claim 7
Dependent Claim
42 words
A process for producing the electrode as defined in claim 1 comprising reducing the oxygen content and adjusting the nitride content to stoichiometric quantities by heating said electrode at temperatures above 500*C in a N2 containing atmosphere of more than 1 bar.
Claim 8
Dependent Claim
15 words
A proceSs as defined in claim 9 wherein said atmosphere additionally contains H2 and/or NH3.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |