Patent US3816079A successfully refreshed from Google Patents.
US3816079A
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Method of producing grid electrodes for electronic discharge vessels
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1972-12-13
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Granted: 1974-06-11
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Expires: 1992-12-13
Abstract
Abstract A grid electrode for an electronic discharge vessel wherein the wire which forms the grid is first covered with a layer of an intermetallic compound comprising a high-melting metal such as zirconium or titanium and a metal of Group VIII of the Periodic System, for example platinum. The intermetallic compound is applied to the grid wire in powdered form and then sintered after which an outer layer of a noble metal, for example platinum is then applied electrolytically.
Inventors
- 👤 R Bachmann
- 👤 C Buxbaum
- 👤 B Zigerlig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:04
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/934; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12861; Y10T428/12875; Y10T428/12986
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
A method as defined in claim 1 for producing grid electrodes for electronic discharge vessels wherein said high-melting metal is zirconium.
Claim 2
Dependent Claim
21 words
A method as defined in claim 2 for producing grid electrodes for electronic discharge vessels wherein said intermetallic compound is ZrPt3.
Claim 3
Dependent Claim
34 words
A method as defined in claim 1 for producing grid electrodes for electronic discharge vessels wherein said intermetallic compound is applied to the wires forming said grid in powder form and is then sintered.
Claim 4
Dependent Claim
72 words
A method as defined in claim 1 for producing grid electrodes for electronic discharge vessels wherein said intermetallic compound in powder form is applied to the wires forming said grid by electrophoresis until the thickness thereof is at least 5 Mu , preferably 5 to 10 Mu , and is then heated in an inert atmosphere or in vacuo to at least 1,500*C, preferably 1,500* to 1,600*C, to thereby sinter the same.
Claim 5
Dependent Claim
23 words
A method as defined in claim 5 for producing grid electrodes for electronic discharge vessels wherein the sintering time is approximately 20 minutes.
Claim 6
Dependent Claim
47 words
A method as defined in claim 1 for producing grid electrodes for electronic discharge vessels wherein said outer platinum layer is applied electrolytically to the intermediate coating and said grid is then annealed in vacuo at a temperature of at least 1,000*C, preferably from 1,500* to 1,600*C.
Claim 7
Dependent Claim
28 words
A method as defined in claim 7 for producing grid electrodes for electronic discharge vessels wherein the thickness of the applied platinum is at least 3 Mu .
Claim 8
Dependent Claim
21 words
A method as defined in claim 1 for producing grid electrodes for electronic discharge vessels wherein said high-melting metal is titanium.
Claim 9
Dependent Claim
43 words
A grid electrode for electronic discharge vessels comprising a base metal forming the grid wire, an intermediate layer of an intermetallic compound comprising a high-melting metal and platinum applied to said wire, and an outer layer of platinum applied to said intermediate layer.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |