Patent US4594181A successfully refreshed from Google Patents.
US4594181A
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US
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Metal oxide-coated copper powder
Assignee: EIDP Inc
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Filing: 1984-09-17
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Granted: 1986-06-10
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Expires: 2004-09-17
Abstract
Abstract Particles of Cu-containing metal having a particle size of 0.5-20 mu m in largest dimension bearing a thin, substantially continuous coating of at least one metal oxide having a free energy of formation more negative than -98 kcal/mole and method of making them. The metal oxide-coated particles have improved sintering and shrinking properties which closely match those of green ceramic tape.
Inventors
- 👤 Vincent P. Siuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:49
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; B; B22; B22F; B22F1/00; B22F1/16; C; C09; C09D; C09D5/00; C09D5/24; H01; H01B; H01B1/00; H01B1/02; H01B1/026; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A printable thick film conductive composition comprising a dispersion in an organic medium of the particles of Cu-containing metal having sintering and shrinkage characteristics which more closely match those of green ceramic tape, bearing a substantially continuous coating of at least one metal oxide having a free energy of formation more negative than -98 kcal/mole and having a particle size of 0.5-20 μm in largest dimension and a surface area less than 1.0 m 2 /g.
Claim 2
Dependent Claim
76 words
A printable thick film conductive composition comprising a dispersion in an organic medium of the particles of Cu-containing metal having sintering and shrinkage characteristics which more closely match those of green ceramic tape, bearing a substantially continuous coating of at least one metal oxide having a free energy of formation more negative than -98 kcal/mole and having a particle size of 0.5-20 μm in largest dimension and a surface area less than 1.0 m 2 /g.
Claim 3
Dependent Claim
36 words
The composition of claim 1 in which the coating is an oxide of a metal selected from the group consisting of Si, Ti, Ce, Zr, Al, Ba, Sr, La, Mg, Ca, V, Ta and mixtures thereof.
Claim 4
Dependent Claim
25 words
The composition of claim 1 in which the Cu-containing metal is selected from the group consisting of Cu, Cu/Cd, Cu/Zr, Cu/Ti, Cu/Cr and mixtures thereof.
Claim 5
Dependent Claim
12 words
The composition of claim 3 in which the Cu-containing metal is Cu.
References Cited (Backward Citations)
US2993815A
Cited
US3988647A
Cited
US4072771A
Cited
JPS571115A
Cited
US4503090A
Cited
US4521329A
Cited
US4514321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |