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US3582702A
Expired / Lapsed
US
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Thermionic electron-emissive electrode with a gas-binding material
Assignee: US Philips Corp
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Filing: 1969-04-01
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Granted: 1971-06-01
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Expires: 1989-04-01
Abstract
Abstract A thermionic cathode including a support in the form of a metal sheet with an electron-emissive coating on one side and a coating of gas-binding material on the opposite side. The sheet may be formed into a tube and the electron-emissive coating may be on the outside or inside and the gas-binding material on the opposite side. Such cathodes may be employed in electric discharge tubes, such as cathode-ray tubes and low-pressure gasdischarge lamps.
Inventors
- 👤 Friedrich Hermann Raymun Almer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:09
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/14; H01J7/18; H01J7/186; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J29/00; H01J29/94; H01J61/00; H01J61/02; H01J61/24; H01J61/26
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
34 words
A thermionic electron-emissive electrode comprising a support consisting of metal sheet, an electron-emissive coating on one surface of said support, and a coating of a gas-binding material on the opposite surface of said support.
Claim 2
Dependent Claim
34 words
A thermionic electron-emissive electrode comprising a support consisting of metal sheet, an electron-emissive coating on one surface of said support, and a coating of a gas-binding material on the opposite surface of said support.
Claim 3
Dependent Claim
21 words
A thermionic electron-emissive electrode as claimed in claim 1, wherein the support has a thickness of between 20 and 100 m.
Claim 4
Dependent Claim
21 words
A thermionic electron-emissive electrode as claimed in claim 1 wherein the gas-binding material is also an activator for the emissive coating.
Claim 5
Dependent Claim
30 words
A thermionic electron-emmissive electrode as claimed in claim 1 wherein the gas-binding material consists of an element selected from the group consisting of one zirconium, titanium, lanthanum, cerium and thorium.
Claim 6
Dependent Claim
32 words
A thermionic electron-emissive electrode as claimed in claim 1 wherein the gas-binding material is mixed with 20- 60 percent by weight of at least one of the powders of tungsten and nickel.
Claim 7
Dependent Claim
36 words
A thermionic electron-emissive electrode as claimed in claim 1 wherein the gas-binding coating consists of metal particles sintered to the support between which the gas-binding material is provided, the metal particles substantially surrounding the gas-binding material.
Claim 8
Dependent Claim
49 words
A thermionic electron-emissive electrode as claimed in claim 1 wherein the electron-emissive coating consists of metal particles sintered to the support between which emitting material having a work function smaller than 2 ev. is provided, the metal particles having a shape such that they largely surround the emitting material.
Claim 9
Dependent Claim
20 words
A thermionic electron-emissive electrode as claimed in claim 1 wherein the metal support consists at least in part of nickel.
Claim 10
Dependent Claim
16 words
A thermionic electron-emissive electrode as claimed in claim 7 wherein the metal particles consist of nickel.
Claim 11
Dependent Claim
26 words
A thermionic electron-emissive electrode as claimed in claim 9 wherein the electrode contains at least of 1 mg. of emitting material per cm.2 of emitting surface.
Claim 12
Dependent Claim
21 words
A thermionic electron-emissive electrode as claimed in claim 9 wherein the emitting material consists of at least one alkaline earth oxide.
Claim 13
Dependent Claim
38 words
A thermionic electron-emissive electrode as claimed in claim 11, wherein the emitting material is mixed with 1-l0 percent by weight of at least one of the elements selected from the group consisting of titanium, zirconium, hafnium and thorium.
Claim 14
Dependent Claim
44 words
An electric discharge tube including a thermionic electron-emissive electrode comprising a hollow cylinder at least one end of which has an aperture, an emissive coating provided on the outer surface of the cylinder, and a getter material on the inner surface of the cylinder.
Claim 15
Dependent Claim
44 words
An electric discharge tube including a thermionic electron-emissive electrode comprising a hollow cylinder at least one end of which has an aperture, an emissive coating provided on the outer surface of the cylinder, and a getter material on the inner surface of the cylinder.
Claim 16
Dependent Claim
47 words
A cathode-ray tube including a thermionic electron-emissive electrode comprising a hollow cylinder one end of which is closed by a metal sheet, the outer side of said cylinder being provided with an emissive coating and the inner side of the cylinder being provided with a gas-binding coating.
Claim 17
Dependent Claim
47 words
A cathode-ray tube including a thermionic electron-emissive electrode comprising a hollow cylinder one end of which is closed by a metal sheet, the outer side of said cylinder being provided with an emissive coating and the inner side of the cylinder being provided with a gas-binding coating.
Claim 18
Dependent Claim
44 words
A low-pressure gas-discharge lamp comprising a thermionic electron-emissive electrode comprising a hollow cylinder at least one end of which has an aperture, an emissive coating provided on the inner side of the cylinder, and a gas-binding coating on the outer surface of said cylinder.
Claim 19
Dependent Claim
44 words
A low-pressure gas-discharge lamp comprising a thermionic electron-emissive electrode comprising a hollow cylinder at least one end of which has an aperture, an emissive coating provided on the inner side of the cylinder, and a gas-binding coating on the outer surface of said cylinder.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |