Patent US4079164A successfully refreshed from Google Patents.
US4079164A
Expired / Lapsed
US
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Base metal plate for directly heated oxide cathode
Assignee: Hitachi Ltd
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Filing: 1976-07-30
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Granted: 1978-03-14
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Expires: 1996-07-30
Abstract
Abstract A base metal plate for directly heated oxide cathode comprising a plate of Ni-W-Zr alloy containing 20 to 30% by weight of W and 0.3 to 5.0% by weight of Zr, which can further contain a small amount of other reducing element such as Mg, Al, or Si, and having a thickness of not more than 50μ. The base metal plate is prepared by powder metallurgy, and has a good life time of electron emission and a good strength in the operating temperature range of cathode.
Inventors
- 👤 Akira Misumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:11
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15; H01J1/18; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/28; Y10T428/2843
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
44 words
A base metal plate for the directly heated oxide cathode, which comprises a plate of Ni-W-Zr alloy containing 20 to 30% by weight of W and 0.3 to 5.0% by weight of Zr, and said plate having a thickness of not more than 50μ.
Claim 2
Dependent Claim
44 words
A base metal plate for the directly heated oxide cathode, which comprises a plate of Ni-W-Zr alloy containing 20 to 30% by weight of W and 0.3 to 5.0% by weight of Zr, and said plate having a thickness of not more than 50μ.
Claim 3
Dependent Claim
51 words
A base metal plate for the directly heated oxide cathode, which comprises a plate of Ni-base alloy containing 20 to 30% by weight of W, 0.3 to 5.0% by weight of Zr, and a small amount of other reducing element, and said plate having a thickness of not more than 50μ.
Claim 4
Dependent Claim
51 words
A base metal plate for the directly heated oxide cathode, which comprises a plate of Ni-base alloy containing 20 to 30% by weight of W, 0.3 to 5.0% by weight of Zr, and a small amount of other reducing element, and said plate having a thickness of not more than 50μ.
Claim 5
Dependent Claim
19 words
A base metal plate according to claim 2, where the other reducing element is Mg, Al, Si or C.
Claim 6
Dependent Claim
19 words
A base metal plate according to claim 1, wherein said plate has a thickness of not more than 30μ.
Claim 7
Dependent Claim
27 words
A base metal plate according to claim 1, wherein Zr is present in said alloy as an intermetallic compound having the formula (Ni-W) x Zr y .
Claim 8
Dependent Claim
19 words
A base metal plate according to claim 3, wherein said plate has a thickness of not more than 30μ.
Claim 9
Dependent Claim
27 words
A base metal plate according to claim 3, wherein Zr is present in said alloy as an intermetallic compound having the formula (Ni-W) x Zr y .
Claim 10
Dependent Claim
68 words
In a base metal plate structure for a directly heated oxide cathode including a plate of a Ni-W-Zr alloy, the improvement comprising said plate having a thickness of not more than 50μ, and Zr being present in said alloy in an amount and in a form to be consumed as a reducing element to provide a lifetime electron emission period for said cathode of at least 25,000 hours.
Claim 11
Dependent Claim
68 words
In a base metal plate structure for a directly heated oxide cathode including a plate of a Ni-W-Zr alloy, the improvement comprising said plate having a thickness of not more than 50μ, and Zr being present in said alloy in an amount and in a form to be consumed as a reducing element to provide a lifetime electron emission period for said cathode of at least 25,000 hours.
Claim 12
Dependent Claim
29 words
A base metal plate structure according to claim 8, wherein said Zr is present in said alloy in the form of an intermetallic compound (Ni-W) x Zr y .
Claim 13
Dependent Claim
23 words
A base metal plate structure according to claim 9, wherein said Zr is present in an amount of 0.3 to 5.0% by weight.
Claim 14
Dependent Claim
26 words
A base metal plate structure according to claim 10, wherein said W is present in said alloy in an amount of 20 to 30% by weight.
Claim 15
Dependent Claim
20 words
A base metal plate structure according to claim 11, wherein said thickness of said plate is not more than 30μ.
Claim 16
Dependent Claim
23 words
A base metal plate structure according to claim 8, wherein said Zr is present in an amount of 0.3 to 5.0% by weight.
Claim 17
Dependent Claim
26 words
A base metal plate structure according to claim 8, wherein said W is present in said alloy in an amount of 20 to 30% by weight.
Claim 18
Dependent Claim
20 words
A base metal plate structure according to claim 8, wherein said thickness of said plate is not more than 30μ.
Claim 19
Dependent Claim
67 words
In a directly heated oxide cathode including a base metal plate and an oxide layer on said base metal plate, the improvement comprising said base metal plate, the improvement comprising said base plate being constituted by a Ni-W-Zr alloy containing 20 to 30% by weight of W and 0.3 to 5.0% by weight of Zr, and said base plate having a thickness of not more than 50μ.
Claim 20
Dependent Claim
67 words
In a directly heated oxide cathode including a base metal plate and an oxide layer on said base metal plate, the improvement comprising said base metal plate, the improvement comprising said base plate being constituted by a Ni-W-Zr alloy containing 20 to 30% by weight of W and 0.3 to 5.0% by weight of Zr, and said base plate having a thickness of not more than 50μ.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |