US5380451A
Expired / Lapsed
US
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Bath for the pre-treatment of light metals
Assignee: Individual
•
Filing: 1993-03-02
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Granted: 1995-01-10
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Expires: 2013-03-02
Abstract
Abstract A bath for pre-treatment of light metals that form oxide layers, before electroless (chemical) metal deposition is an aqueous bath containing phosphorous acid. The bath is used in the following process for electroless deposition of nickel: (1) Degreasing by boiling (2) Rinsing (3) Pickling (4) Rinsing (5) Treatment in aqueous bath containing phosphoric acid (6) Rinsing with water (7) Chemically nickel plating (8) Rinsing. The light metal articles are packed in a drum that is immersed and rotated in the pre-treatment bath. Current and voltage are applied to a light metal bar that is attached to a non-rotating place on the drum.
Inventors
- 👤 Franz Rieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:49
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/1803; C23C18/1824; C23C18/1827; C23C18/1834; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
27 words
Bath for the pre-treatment of light metals that form oxide layers, prior to electroless metal deposition on said light metals, comprising an aqueous bath containing phosphoric acid.
Claim 2
Dependent Claim
27 words
Bath for the pre-treatment of light metals that form oxide layers, prior to electroless metal deposition on said light metals, comprising an aqueous bath containing phosphoric acid.
Claim 3
Dependent Claim
14 words
Bath according to claim 1, wherein said bath contains only phosphoric acid in water.
Claim 4
Dependent Claim
15 words
Bath according to claim 1, wherein said bath contains 100-550 g/L phosphoric acid in water.
Claim 5
Dependent Claim
14 words
Bath according to claim 3, wherein said bath contains 150-500 g/L of phosphoric acid.
Claim 6
Dependent Claim
14 words
Bath according to claim 4, wherein said bath contains 200-450 g/L of phosphoric acid.
Claim 7
Dependent Claim
14 words
Bath according to claim 4, wherein said bath contains 300 g/L±30% of phosphoric acid.
Claim 8
Dependent Claim
14 words
Bath according to claim 6, wherein said bath contains 300 g/L±20% of phosphoric acid.
Claim 9
Dependent Claim
14 words
Bath according to claim 6, wherein said bath contains 300 g/L±10% of phosphoric acid.
Claim 10
Dependent Claim
21 words
Bath according to claim 1, wherein said bath is the same as baths used for deposition of metal using external current.
Claim 11
Dependent Claim
14 words
Bath according to claim 1, wherein the water of said bath is tap water.
Claim 12
Dependent Claim
14 words
Bath according to claim 1, wherein the water of said bath is distilled water.
Claim 13
Dependent Claim
14 words
Bath according to claim 1, wherein the water of said bath is deionized water.
Claim 14
Dependent Claim
15 words
Bath according to claim 1, wherein the water of said bath is completely de-salted water.
Claim 15
Dependent Claim
13 words
Bath according to claim 1, wherein said phosphoric acid is free from halogens.
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) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |