Patent US4208208A successfully refreshed from Google Patents.
US4208208A
Expired / Lapsed
US
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Nickel alloy base metal plate for directly heated oxide cathodes
Assignee: Hitachi Ltd
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Filing: 1978-11-16
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Granted: 1980-06-17
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Expires: 1998-11-16
Abstract
Abstract Base metal plate materials comprising nickel as a main component, rhenium and tungsten, and if desired, a small amount of at least one reducing agent can be used for producing quick operating type directly heated oxide cathodes showing no peeling of the oxide layer from the base metal and having excellent mechanical strength at high temperatures and specific electric resistance.
Inventors
- 👤 Akira Misumi
- 👤 Masaharu Kumada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:51
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15; H01J1/18; C; C22; C22C; C22C19/00; C22C19/03; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
A base metal plate material for a directly heated oxide cathode which comprises an alloy containing rhenium in the range from 4 to 17% by weight, tungsten in the range from 1 to 6% by weight and the remainder being nickel.
Claim 2
Dependent Claim
41 words
A base metal plate material for a directly heated oxide cathode which comprises an alloy containing rhenium in the range from 4 to 17% by weight, tungsten in the range from 1 to 6% by weight and the remainder being nickel.
Claim 3
Dependent Claim
43 words
A base metal plate material according to claim 1, wherein the amount of rhenium is in the range from 9 to 14% by weight, the amount of tungsten is in the range from 1 to 6% by weight, and the remainder is nickel.
Claim 4
Dependent Claim
23 words
A base metal plate material according to claim 1, wherein said base metal plate material has a thickness of 100 μm or less.
Claim 5
Dependent Claim
36 words
A base metal plate material according to claim 1 wherein said alloy further contains up to 6% by weight of at least one reducing agent selected from a group consisting of zirconium, magnesium, silicon and aluminum.
Claim 6
Dependent Claim
21 words
A base metal plate material according to claim 4, wherein the reducing agent is 6% by weight or less of zirconium.
Claim 7
Dependent Claim
25 words
A base metal plate material according to claim 4, wherein said at least one reducing agent is an impurity amount of magnesium, silicon and/or aluminum.
Claim 8
Dependent Claim
22 words
A base metal plate material according to claim 5, wherein zirconium is used in an amount of 0.4 to 0.8% by weight.
References Cited (Backward Citations)
US2720458A
Cited
US2858207A
Cited
US2833647A
Cited
US3674710A
Cited
US3745403A
Cited
US3922428A
Cited
US3902093A
Cited
US4079164A
Cited
US4081713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |