US4615747A
Expired / Lapsed
US
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Process for producing aluminum material for use in vacuum
Assignee: Resonac Holdings Corp
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Filing: 1984-12-17
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Granted: 1986-10-07
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Expires: 2004-12-17
Abstract
Abstract An aluminum material for use in a vacuum is produced by a process comprising the steps of removing a hydrated oxide coating from the surface of a worked aluminum material to obtain a clean surface in a dry state, and heating the aluminum material in an oxygen gas-containing atmosphere out of contact with the water-containing atmosphere to form an oxide coating on the dry clean surface.
Inventors
- 👤 Yutaka Kato
- 👤 Kenji Tsukamoto
- 👤 Eizo Isoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:10
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/002; C; C23; C23C; C23C8/00; C23C8/02; C23C8/06; C23C8/08; C23C8/10; C23C8/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
65 words
A process for producing an aluminum material for use in a vacuum comprising the steps of removing a hydrated oxide coating from the surface of a worked aluminum material to obtain a clean surface in a dry state, and heating the aluminum material in an oxygen gas-containing atmosphere out of contact with a water-containing atmosphere to form an oxide coating on the dry clean surface.
Claim 2
Dependent Claim
65 words
A process for producing an aluminum material for use in a vacuum comprising the steps of removing a hydrated oxide coating from the surface of a worked aluminum material to obtain a clean surface in a dry state, and heating the aluminum material in an oxygen gas-containing atmosphere out of contact with a water-containing atmosphere to form an oxide coating on the dry clean surface.
Claim 3
Dependent Claim
23 words
A process as defined in claim 1 wherein the dry clean surface is obtained by dry-etching the suface of the worked aluminum material.
Claim 4
Dependent Claim
31 words
A process as defined in claim 1 wherein the dry clean surface is obtained by subjecting the surface of the worked aluminum material to alkaline pickling and thereafter drying the surface.
Claim 5
Dependent Claim
59 words
A process as defined in claim 3 wherein the pickled aluminum material is immersed, before the drying, in an aqueous solution containing at least one of chromic acid, silicic acid, vanadic acid, zirconic acid, phosphoric acid, permanganic acid, tungstic acid, molybdic acid and salts of these acids, whereby the material is treated for the inhibition of hydrated oxide coating.
Claim 6
Dependent Claim
17 words
A process as defined in claim 3 wherein the pickled surface is dried in a vacuum atmosphere.
Claim 7
Dependent Claim
18 words
A process as defined in claim 3 wherein the pickled surface is dried in an inert gas atmosphere.
Claim 8
Dependent Claim
24 words
A process as defined in claim 3 wherein the pickled surface is dried in the temperature range of from room temperature to 120° C.
Claim 9
Dependent Claim
31 words
A process as defined in claim 1 wherein the dry clean surface is obtained by subjecting the surface of the worked aluminum material to acid pickling and thereafter drying the surface.
Claim 10
Dependent Claim
59 words
A process as defined in claim 8 wherein the pickled aluminum material is immersed, before the drying, in an aqueous solution containing at least one of chromic acid, silicic acid, vanadic acid, zirconic acid, phosphoric acid, permanganic acid, tungstic acid, molybdic acid and salts of these acids, whereby the material is treated for the inhibition of hydrated oxide coating.
Claim 11
Dependent Claim
17 words
A process as defined in claim 8 wherein the pickled surface is dried in a vacuum atmosphere.
Claim 12
Dependent Claim
18 words
A process as defined in claim 8 wherein the pickled surface is dried in an inert gas atmosphere.
Claim 13
Dependent Claim
24 words
A process as defined in claim 8 wherein the pickled surface is dried in the temperature range of from room temperature to 120° C.
Claim 14
Dependent Claim
32 words
A process as defined in claim 1 wherein the oxygen gas-containing atmosphere is a mixed gas atmosphere containing 0.5 to 30 vol. % of oxygen gas, the balance being an inert gas.
Claim 15
Dependent Claim
23 words
A process as defined in claim 1 wherein the oxygen gas-containing atmosphere is an inert gas atmosphere containing oxygen gas as an impurity.
Claim 16
Dependent Claim
19 words
A process as defined in claim 1 wherein the oxygen gas-containing atmosphere is a vacuum atmosphere containing remaining oxygen.
Claim 17
Dependent Claim
63 words
A process for producing an aluminum material for use in a vacuum comprising the steps of dry-etching the surface of a worked aluminum material to obtain a dry clean surface free from a hydrated oxide coating, and heating the aluminum material in an oxygen-containing atmosphere out of contact with a atmosphere containing water to form an oxide coating on the dry clean surface.
Claim 18
Dependent Claim
63 words
A process for producing an aluminum material for use in a vacuum comprising the steps of dry-etching the surface of a worked aluminum material to obtain a dry clean surface free from a hydrated oxide coating, and heating the aluminum material in an oxygen-containing atmosphere out of contact with a atmosphere containing water to form an oxide coating on the dry clean surface.
Claim 19
Dependent Claim
70 words
A process for producing an aluminum material for use in a vacuum comprising the steps of cleaning the surface of a worked aluminum material to remove a hydrated oxide coating from the surface and obtain a clean surface, drying the clean surface, and heating the aluminum material in an oxygen-gas containing atmosphere out of contact with a atmosphere containing water to form an oxide coating on the dry clean surface.
Claim 20
Dependent Claim
70 words
A process for producing an aluminum material for use in a vacuum comprising the steps of cleaning the surface of a worked aluminum material to remove a hydrated oxide coating from the surface and obtain a clean surface, drying the clean surface, and heating the aluminum material in an oxygen-gas containing atmosphere out of contact with a atmosphere containing water to form an oxide coating on the dry clean surface.
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) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |