US4937016A
Expired / Lapsed
US
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Copper conductor composition
Assignee: Dowa Holdings Co Ltd
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Filing: 1989-02-01
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Granted: 1990-06-26
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Expires: 2009-02-01
Abstract
Abstract A copper conductor composition comprising a copper powder, an inorganic oxide powder, a glass powder and an organic vehicle, said copper powder having an average particle size of 0.5 to 3 mu m, a tap density of 3.0 to 5.0 g/cm3, and an oxygen content of 0.05 to 0.15% by weight. Zinc oxide powder and, optionally, nickel powder are used as the inorganic oxide powder. The composition which contains the copper powder having such an oxygen content as low as 0.05 to 0.15% by weight, can provide copper conductors having excellent conductor properties such as solderability, adhesive strength and matching property to resistances.
Inventors
- 👤 Masatoshi Suehiro
- 👤 Masashi Echigo
- 👤 Masami Sakuraba
- 👤 Nobutoshi Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:57
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H01; H01B; H01B1/00; H01B1/14; H01B1/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A copper conductor composition comprising 100 parts by weight of a copper powder having an average particle size of 0.5 to 0.3 μm, a tap density of 3.0 to 5.0 g/cm 3 and an oxygen content of 0.05 to 0.15% by weight; 0.2 to 3 parts by weight of a zinc oxide powder having an average particle size of 0.5 to 5μm; 0 to 2 parts by weight of a nickel oxide powder having an average particle size of 0.5 to 5μm; 1 to 10 parts by weight of a glass powder and 10 to 30 parts by weight of an organic vehicle.
Claim 2
Dependent Claim
103 words
A copper conductor composition comprising 100 parts by weight of a copper powder having an average particle size of 0.5 to 0.3 μm, a tap density of 3.0 to 5.0 g/cm 3 and an oxygen content of 0.05 to 0.15% by weight; 0.2 to 3 parts by weight of a zinc oxide powder having an average particle size of 0.5 to 5μm; 0 to 2 parts by weight of a nickel oxide powder having an average particle size of 0.5 to 5μm; 1 to 10 parts by weight of a glass powder and 10 to 30 parts by weight of an organic vehicle.
Claim 3
Dependent Claim
30 words
The composition of claim 1, wherein said copper powder is obtained by reducing a cuprous oxide powder with hydrazine to give a copper powder and then hydrogenating the copper powder.
Claim 4
Dependent Claim
36 words
The composition of claim 2, wherein said cuprous oxide powder is a wet precipitate of a cuprous oxide obtained by reducing a copper sulfate with glucose in an alkali hydroxide and separating from the reaction mixture.
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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |