US5017439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro-contamination-free coating for die-cast component in magnetic disk drive
Assignee: Seagate Technology LLC
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Filing: 1989-07-19
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Granted: 1991-05-21
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Expires: 2009-07-19
Abstract
Abstract A process for treating the surface of a die-cast article including the steps of chemically cleaning the surface, cleaning the surface with an argon plasma, depositing an ion vapor generated metallic coating, mechanically treating the deposited coating, and chromate converting the mechanically treated coating. Preferably, the die-cast metal article consists essentially of an aluminum or magnesium alloy while the metallic coating is aluminum. The mechanical treatment may be carried out by bead blasting, tumbling or barreling and may be followed by walnut shell polishing.
Inventors
- 👤 Amarjit S. Brar
- 👤 Prativadi B. Narayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:14
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/16; C23C14/02; C23C14/021; C23C14/58; C23C14/5846; C23C14/5886; C23C22/00; C23C22/78; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12611
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
A process for treating the surface of a die-cast metal article which consists essentially of aluminum alloy or magnesium alloy, comprising: chemically cleaning the surface; cleaning the surface with an argon plasma; depositing an ion vapor generated aluminum coating upon the cleaned surface; mechanically treating the deposited aluminum coating; and chromate converting the mechanically treated coating.
Claim 2
Dependent Claim
56 words
A process for treating the surface of a die-cast metal article which consists essentially of aluminum alloy or magnesium alloy, comprising: chemically cleaning the surface; cleaning the surface with an argon plasma; depositing an ion vapor generated aluminum coating upon the cleaned surface; mechanically treating the deposited aluminum coating; and chromate converting the mechanically treated coating.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the deposition step includes R.F. plasma enhanced vapor deposition.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the mechanical treatment step includes bead blasting.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the mechanical treatment step includes tumbling or barreling.
Claim 6
Dependent Claim
17 words
The process of claim 1 and further comprising the step: mechanically cleaning the mechanically treated deposited coating.
Claim 7
Dependent Claim
22 words
The process of claim 5 wherein the mechanically cleaning step includes: walnut shell polishing the mechanically treated surface prior to chromate converting.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein the cleaned surface is not exposed to oxidizing conditions prior to the metallic deposition step.
Claim 9
Dependent Claim
9 words
An article prepared by the process of claim 1.
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) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |