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US4563399A
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Chromium plating process and article produced
Assignee: Melea Ltd
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Filing: 1984-09-14
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Granted: 1986-01-07
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Expires: 2004-09-14
Abstract
Abstract A chromium plating process wherein first and second chromium layers are employed to enhance corrosion resistance. The chromium layers are separated by a strike of dissimilar metal, preferably nickel deposited using live entry into the nickel electroplating bath.
Inventors
- 👤 Leslie S. Wright, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:01
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/10; C25D5/12; C25D5/14; C25D5/60; C25D5/605; C25D5/611; C25D5/627; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
A process for electroplating a chromium finish on a substrate comprising the steps of: a. preparing the substrate for the application of a first chromium layer; b. electrochemically depositing the first chromium layer onto the prepared substrate; c. electrochemically depositing a strike of dissimilar metal onto the first chromium layer by live entry of the substrate into a plating composition; and d. electrochemically depositing a second chromium layer onto the strike of dissimilar metal.
Claim 2
Dependent Claim
74 words
A process for electroplating a chromium finish on a substrate comprising the steps of: a. preparing the substrate for the application of a first chromium layer; b. electrochemically depositing the first chromium layer onto the prepared substrate; c. electrochemically depositing a strike of dissimilar metal onto the first chromium layer by live entry of the substrate into a plating composition; and d. electrochemically depositing a second chromium layer onto the strike of dissimilar metal.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein step a. includes electrochemically depositing a nickel undercoating.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein step a. includes electrochemically depositing copper-nickel undercoatings.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the dissimilar metal at step c. is nickel.
Claim 6
Dependent Claim
52 words
The process of claim 1 wherein step c. includes the sub-steps of, depositing a first strike of nickel of a composition selected for its adhesive properties to the first chromium layer, and depositing a second strike of bright nickel of a composition selected to enhance the luster of the second chromium layer.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the first chromium layer is approximately 0.000015 inch thick.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein the second chromium layer is approximately 0.000015 inch thick.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein the strike of dissimilar metal is at least 0.00005 inch thick.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein the substrate is a plastic.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein the substrate is a metal.
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein the second chromium layer is caused to be microdiscontinuous.
Claim 13
Dependent Claim
27 words
An article having an electroplated chromium finish made in accordance with the process of claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11.
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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |