US4369392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide-coated cathode and method of producing the same
Assignee: Panasonic Holdings Corp
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Filing: 1980-09-16
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Granted: 1983-01-18
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Expires: 2000-09-16
Abstract
Abstract An oxide-coated cathode used for the electron tubes such as cathode ray tubes and camera tubes, comprising as the base a sintered product principally composed of an alkaline earth metal compound and a high-melting-point metal and having high heat conductivity and low specific resistance, said sintered product being either used singly or layered on a high-melting-point metal body containing a reducible element or elements as impurity, and an oxide cathode material coated on said base, and a method of producing such oxide-coated cathode.
Inventors
- 👤 Sadayoshi Hotta
- 👤 Masanori Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:13
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/142
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
An oxide-coated cathode comprising as the base a sintered product principally composed of an alkaline earth metal compound and a high-melting-point metal and having high heat conductivity and low specific resistance, said sintered product being used either singly or provided on a high-melting-point metal layer containing a reducible element as impurity, said base being coated with an oxide cathode material.
Claim 2
Dependent Claim
60 words
An oxide-coated cathode comprising as the base a sintered product principally composed of an alkaline earth metal compound and a high-melting-point metal and having high heat conductivity and low specific resistance, said sintered product being used either singly or provided on a high-melting-point metal layer containing a reducible element as impurity, said base being coated with an oxide cathode material.
Claim 3
Dependent Claim
21 words
The oxide-coated cathode according to claim 1, wherein the film thickness of said oxide cathode material is less than 60 μm.
Claim 4
Dependent Claim
81 words
The oxide-coated cathode according to claim 1 or 2, characterized in that a powder mixture consisting of 71-81% by weight of powder of a high-melting-point metal, powder of at least one of the reducible elements such as Al, Si, Mg, Co, Ti, Zr, etc., either in the single form or in the form of a compound, and an alkaline earth metal compound, is pressure molded either singly or together with a high-melting-point metal such as Ni to thereby form said base.
Claim 5
Dependent Claim
36 words
The oxide-coated cathode according to claim 1, 2 or 3, wherein the molar ratio of the alkaline earth metals Ba, Sr and Ca in the alkaline earth metal compound {Ba/(Ba+Sr+Ca)} in said sintered product is 0.75±0.1.
Claim 6
Independent Claim
86 words
A method of producing an oxide-coated cathode which comprises uniformly mixing powder of an alkaline earth metal compound, powder of a high-melting-point metal and powder of at least one of the reducible elements such as Al, Si, Mg, Co, Ti, Zr, etc., either in the single form or in the form of a compound, pressure molding said powder mixture either singly or together with a high-melting-point metal such as Ni to form a cathode base, and then coating said cathode base with an oxide cathode material.
Claim 7
Independent Claim
86 words
A method of producing an oxide-coated cathode which comprises uniformly mixing powder of an alkaline earth metal compound, powder of a high-melting-point metal and powder of at least one of the reducible elements such as Al, Si, Mg, Co, Ti, Zr, etc., either in the single form or in the form of a compound, pressure molding said powder mixture either singly or together with a high-melting-point metal such as Ni to form a cathode base, and then coating said cathode base with an oxide cathode material.
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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |