US4088510A
Expired / Lapsed
US
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Magnesium oxide dynode and method of preparation
Assignee: RCA Corp
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Filing: 1976-02-19
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Granted: 1978-05-09
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Expires: 1996-02-19
Abstract
Abstract A layer of near stoichiometric magnesium oxide on a conducting substrate forms a dynode. The dynode is formed by preparing a layer of oxidized magnesium on a conducting substrate, heating the oxidized magnesium layer in a vacuum between about 400° and about 500° C., and treating the layer to render it more nearly stoichiometric. One method of treating the layer is to expose it to oxygen at about room temperature for about ten to twenty minutes at a pressure between about 10 -6 to 10 -5 torr. Another method of treating the layer is to impinge a noble gas, such as argon, at a pressure suitable for sputter etching, such as between 10 -6 and 10 -3 torr, to remove between ten and twenty atomic layers from the surface of the layer. The layer is then exposed to oxygen at room temperature for about ten to twenty minutes at a pressure between about 10 -6 and 10 -5 torr.
Inventors
- 👤 Joseph Dresner
- 👤 Bernard Goldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:10
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; H; H01; H01J; H01J1/00; H01J1/02; H01J1/32; H01J9/00; H01J9/02; H01J9/12; H01J9/125; H01J2201/00; H01J2201/32
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
76 words
A dynode comprising an electrically conducting substrate; and a layer of magnesium oxide on said substrate, said layer formed by preparing a layer of oxidized magnesium on said substrate, treating the layer to render it more nearly stoichiometric wherein said treating includes heating said oxidized magnesium layer in a vacuum of less than about 10 -7 torr at a temperature between about 400° and 500° C and exposing said dynode to oxygen at about room temperature.
Claim 2
Dependent Claim
76 words
A dynode comprising an electrically conducting substrate; and a layer of magnesium oxide on said substrate, said layer formed by preparing a layer of oxidized magnesium on said substrate, treating the layer to render it more nearly stoichiometric wherein said treating includes heating said oxidized magnesium layer in a vacuum of less than about 10 -7 torr at a temperature between about 400° and 500° C and exposing said dynode to oxygen at about room temperature.
Claim 3
Dependent Claim
17 words
The dynode of claim 1 wherein said exposing is carried out between about ten to twenty minutes.
Claim 4
Dependent Claim
22 words
The dynode of claim 2 wherein said exposing is carried out at a pressure between about 10 -6 and 10 -5 torr.
Claim 5
Dependent Claim
23 words
The dynode of claim 1 wherein said treating includes removing between about 10 to 20 atomic layers from the surface of said dynode.
Claim 6
Dependent Claim
16 words
The dynode of claim 4 wherein said removing is impinging noble gas molecules of said layer.
Claim 7
Dependent Claim
11 words
The dynode of claim 5 wherein said noble gas is argon.
Claim 8
Dependent Claim
22 words
The dynode of claim 6 wherein said argon gas is at a pressure of between about 10 -5 and 10 -3 torr.
Claim 9
Dependent Claim
17 words
The dynode of claim 2 wherein said exposing is carried out for about ten to twenty minutes.
Claim 10
Dependent Claim
22 words
The dynode of claim 8 wherein said exposing is carried out at a pressure between about 10 -6 and 10 -5 torr.
Claim 11
Independent Claim
65 words
A method for making a magnesium oxide dynode comprising preparing a layer of oxidized magnesium on a conducting substrate; and treating said layer to render it more nearly stoichiometric wherein said treating includes heating said layer in a vacuum between about 400° and about 500° C at a pressure less than about 10 -7 torr and exposing said dynode to oxygen at about room temperature.
Claim 12
Independent Claim
65 words
A method for making a magnesium oxide dynode comprising preparing a layer of oxidized magnesium on a conducting substrate; and treating said layer to render it more nearly stoichiometric wherein said treating includes heating said layer in a vacuum between about 400° and about 500° C at a pressure less than about 10 -7 torr and exposing said dynode to oxygen at about room temperature.
Claim 13
Dependent Claim
17 words
The method in accordance with claim 10 wherein said heating is carried out for about one hour.
Claim 14
Dependent Claim
19 words
The method in accordance with claim 11 wherein said exposing is carried out between about 10 to 20 minutes.
Claim 15
Dependent Claim
24 words
The method in accordance with claim 12 wherein said exposing is carried out at a pressure between about 10 -6 and 10 -5 torr.
Claim 16
Dependent Claim
25 words
The method in accordance with claim 11 wherein said treating includes removing between about 10 to 20 atomic layers from the surface of said layer.
Claim 17
Dependent Claim
18 words
The method in accordance with claim 14 wherein said removing is impinging noble gas molecules on said layer.
Claim 18
Dependent Claim
13 words
The method in accordance with claim 15 wherein said noble gas is argon.
Claim 19
Dependent Claim
24 words
The method in accordance with claim 16 wherein said argon gas is at a pressure of between about 10 -5 and 10 -3 torr.
Claim 20
Dependent Claim
19 words
The method in accordance with claim 17 wherein said exposing is carried out for about ten to twenty minutes.
Claim 21
Dependent Claim
24 words
The method in accordance with claim 18 wherein said exposing is carried out at a pressure between about 10 -6 and 10 -5 torr.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |