US3912829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a porous target for an electron tube
Assignee: Japan Broadcasting Corp
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Filing: 1974-05-13
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Granted: 1975-10-14
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Expires: 1994-05-13
Abstract
Abstract A magnesium oxide porous target having a high heat resistance, a uniform glanularity of background and as good or better performances than potassium chloride porous targets is produced by burning metallic magnesium in a mixed gas of oxygen and an inert gas, to form magnesium oxide smoke and depositing the resulting magnesium oxide smoke on a supporting film, the total pressure of the mixed gas and the partial pressure of oxygen being specifically defined.
Inventors
- 👤 Masahiko Takahashi
- 👤 Eikyu Hiruma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:37
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/233
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A METHOD FOR PRODUCING A MAGNESIUM OXIDE POROUS TARGET, WHICH COMPRISES BURNING METALLIC MAGNESIUM UNDER AN ATMOSPHERE OF A MIXED GAS OF GASEOUS OXYGEN AND AN INERT GAS IN WHICH MAGNESIUM OXIDE IS STABLE TO FORM MAGNESIUM OXIDE SMOKE, THE TOTAL PRESSURE OF SAID MIXED GAS BEING 0.5-200 TORR AND THE PARTIAL PRESSURE OF OXYGEN BEING 0.5-50 TORR, AND
Claim 2
Independent Claim
59 words
A METHOD FOR PRODUCING A MAGNESIUM OXIDE POROUS TARGET, WHICH COMPRISES BURNING METALLIC MAGNESIUM UNDER AN ATMOSPHERE OF A MIXED GAS OF GASEOUS OXYGEN AND AN INERT GAS IN WHICH MAGNESIUM OXIDE IS STABLE TO FORM MAGNESIUM OXIDE SMOKE, THE TOTAL PRESSURE OF SAID MIXED GAS BEING 0.5-200 TORR AND THE PARTIAL PRESSURE OF OXYGEN BEING 0.5-50 TORR, AND
Claim 3
Dependent Claim
21 words
The method as claimed in claim 1, wherein a thickness of the deposited magnesium oxide porous film is 10-30 Mu .
Claim 4
Dependent Claim
35 words
The method as claimed in claim 1, wherein the partial pressure of oxygen is 6 Torr, the partial pressure of nitrogen is 24 Torr and the total pressure of the mixed gas is 30 Torr.
Claim 5
Dependent Claim
21 words
The method as claimed in claim 3, wherein a thickness of the magnesium oxide porous film is about 20 Mu .
Claim 6
Dependent Claim
25 words
The method as claimed in claim 1, wherein said inert gas is selected from the group consisting of: nitrogen, argon, neon, helium or mixtures thereof.
Claim 7
Dependent Claim
39 words
The method as claimed in claim 1, wherein the supporting film comprises an aluminum oxide film having an aluminum metal film evaporated thereon, with a reinforcement metal mesh stretched thereoN and a layer of aluminum metal evaporated there on.
References Cited (Backward Citations)
US3308324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |