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US4428986A
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Method of preparing a beryllia substrate for subsequent autocatalytic deposition of a metallized film directly thereon
Assignee: Eaton Corp
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Filing: 1982-11-18
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Granted: 1984-01-31
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Expires: 2002-11-18
Abstract
Abstract Beryllia is prepared for direct autocatalytic plating of a metal film by immersing it first in a sodium hydroxide solution for roughening the surface uniformly, rinsing it in water, then immersing it in a fluoride-based solution for etching silica and magnesium from the grain boundaries, rinsing it in water and then plating the beryllia by conventional methods for metallizing non-conductors.
Inventors
- 👤 Steven R. Schachameyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:44
CPC Classifications
H; H10; H10W; H10W99/00; C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/1851; C23C18/1862; C23C18/1865; C23C18/1872; C23C18/1886; C23C18/1889; C23C18/1893; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/38; H05K3/381
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
98 words
A method of preparing a beryllia substrate for a subsequent autocatalytic deposition of a metallized film directly thereon comprising chemically etching the substrate to roughen the surfaces thereof, said chemical etching comprising the steps of exposing said substrate to a solution in which beryllia is soluble for establishing a uniform surface profile for the substrate, then rinsing the substrate with a neutral solution, and then exposing the substrate to a solution in which other constituents of the substrate are soluble to remove said other constituents from the grain boundaries of the beryllia at the surface of the substrate.
Claim 2
Independent Claim
98 words
A method of preparing a beryllia substrate for a subsequent autocatalytic deposition of a metallized film directly thereon comprising chemically etching the substrate to roughen the surfaces thereof, said chemical etching comprising the steps of exposing said substrate to a solution in which beryllia is soluble for establishing a uniform surface profile for the substrate, then rinsing the substrate with a neutral solution, and then exposing the substrate to a solution in which other constituents of the substrate are soluble to remove said other constituents from the grain boundaries of the beryllia at the surface of the substrate.
Claim 3
Independent Claim
45 words
A method of preparing a beryllia substrate for a subsequent autocatalytic deposition of a metallized film directly thereon comprising, in order: immersing said substrate in an alkali metal salt solution; rinsing said substrate with a neutral solution; and immersing said substrate in a fluoride-based solution.
Claim 4
Independent Claim
45 words
A method of preparing a beryllia substrate for a subsequent autocatalytic deposition of a metallized film directly thereon comprising, in order: immersing said substrate in an alkali metal salt solution; rinsing said substrate with a neutral solution; and immersing said substrate in a fluoride-based solution.
Claim 5
Dependent Claim
29 words
The method of claim 2 further comprising the additional steps of rinsing said substrate with a neutral solution followed by autocatalytic plating a metallized film directly on said substrate.
Claim 6
Dependent Claim
16 words
The method of claim 3 wherein said alkali metal salt solution is a sodium hydroxide solution.
Claim 7
Dependent Claim
19 words
The method of claim 4 wherein said sodium hydroxide solution is an aqueous solution 50% by weight sodium hydroxide.
Claim 8
Dependent Claim
17 words
The method of claim 4 wherein the temperature of said sodium hydroxide solution is about 250° C.
Claim 9
Dependent Claim
16 words
The method of claim 3 wherein the temperature of said fluoride-based solution is about 25° C.
Claim 10
Dependent Claim
14 words
The method of claim 3 wherein said fluoride-based solution is a fluorboric acid solution.
Claim 11
Dependent Claim
20 words
The method of claim 8 wherein said fluorboric acid solution is an aqueous solution 30% volume to volume fluorboric acid.
Claim 12
Dependent Claim
14 words
The method of claim 3 wherein said fluoride-based solution is a hydrofluoric acid solution.
Claim 13
Dependent Claim
20 words
The method of claim 10 wherein said hydrofluoric acid solution is an aqueous solution 30% volume to volume hydrofluoric acid.
Claim 14
Dependent Claim
20 words
The method of claim 6 wherein said substrate is immersed in said sodium hydroxide solution for 7 to 20 minutes.
Claim 15
Dependent Claim
19 words
The method of claim 7 wherein said substrate is immersed in said fluroide-based solution for 5 to 20 minutes.
Claim 16
Dependent Claim
15 words
The method of claim 3 wherein said neutral solution rinses are a clear water rinses.
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) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |