Patent US4795658A successfully refreshed from Google Patents.
US4795658A
Expired / Lapsed
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Method of metallizing ceramic material
Assignee: Murata Manufacturing Co Ltd
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Filing: 1987-02-25
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Granted: 1989-01-03
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Expires: 2007-02-25
Abstract
Abstract A method of metallizing a ceramic material by forming a metal thin film through electroless plating, chemically etching the metal thin film after heat treatment and metallizing the surface of the ceramic material through electroless plating after the etching.
Inventors
- 👤 Osamu Kano
- 👤 Atsuo Senda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:25
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H; H05; H05K; H05K3/00; H05K3/38; H05K3/381
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
A method of metallizing a ceramic material comprising: (a) forming a metal thin film on the surface of said ceramic material by electroless plating; (b) performing heat treatment in a temperature range of substantially 900° to 1200° C. on said ceramic surface having said metal thin film formed thereon; (c) chemically etching to remove said metal thin film; and (d) metallizing said ceramic surface by electroless plating after said etching.
Claim 2
Independent Claim
70 words
A method of metallizing a ceramic material comprising: (a) forming a metal thin film on the surface of said ceramic material by electroless plating; (b) performing heat treatment in a temperature range of substantially 900° to 1200° C. on said ceramic surface having said metal thin film formed thereon; (c) chemically etching to remove said metal thin film; and (d) metallizing said ceramic surface by electroless plating after said etching.
Claim 3
Dependent Claim
29 words
A method of metallizing a ceramic material in accordance with claim 1, wherein said metal thin film formed by said electroless plating is 0.05 to 0.5 μm in thickness.
Claim 4
Dependent Claim
32 words
A method of metallizing a ceramic material in accordance with claim 1, wherein said ceramic material is prepared from ZrO 2 -TiO 2 -SnO 2 ceramics or Al 2 O 3 .
Claim 5
Dependent Claim
26 words
A method of metallizing a ceramic material in accordance with claim 1, wherein said metal thin film comprises copper and said heat treatment forms copper oxide.
Claim 6
Dependent Claim
45 words
A method of metallizing a ceramic material in accordance with claim 1, further comprising prior to step (a) the additional steps of: sensitizing the ceramic material surface with a solution of stannous chloride; and activating the ceramic material surface with a solution of palladium chloride.
Claim 7
Dependent Claim
26 words
A method of metallizing a ceramic material in accordance with claim 1, wherein said metallizing step (d) forms a copper film substantially 1-10 μm in thickness.
Claim 8
Dependent Claim
26 words
A method of metallizing a ceramic material in accordance with claim 2, wherein said metal thin film is chemically etched with an acid having low concentration.
Claim 9
Dependent Claim
25 words
A method of metallizing a ceramic material in accordance with claim 2, wherein said metal thin film is substantially 0.1 to 0.5 μm in thickness.
Claim 10
Dependent Claim
23 words
A method of metallizing a ceramic material in accordance with claim 8, wherein said metal thin film is substantially 0.3 μm in thickness.
Claim 11
Dependent Claim
25 words
A method of metallizing a ceramic material in accordance with claim 9, wherein said heat treatment is performed substantially at a temperature of 1000° C.
Claim 12
Dependent Claim
56 words
A method of metallizing a ceramic material in accordance with claim 7, wherein said metal thin film is chemically etched for less than substantially 10 minutes at a temperature lower than substantially 100° C. with an acid selected from the group consisting of dilute hydrochloric acid, dilute nitric acid, and an aqueous solution of hydrofluoric acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |