Patent US4552691A successfully refreshed from Google Patents.
US4552691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive pastes
Assignee: Resonac Holdings Corp
•
Filing: 1984-08-09
•
Granted: 1985-11-12
•
Expires: 2004-08-09
Abstract
Abstract An electrically conductive paste is disclosed, which comprises (i) 60 to 90 wt % of metal fine powders comprising a silver fine powder, a composite fine powder of silver and copper and optionally either, a composite fine powder of silver and platinum or a platinum fine powder, or a composite fine powder of silver and palladium or a palladium fine powder, the copper content in the metal fine powders is 0.1 to 10 wt %, the platinum content, if present, is 0.2-10 wt % and the palladium content, if present, is 0.2-30 wt %, and (ii) 10 to 40 wt % of a vehicle component, such as terpineol, butylcarbitol, ethyl cellulose etc. The product can resist thermal shocks and has strong bonding strength having remarkably improved heat deterioration characteristics.
Inventors
- 👤 Takashi Shoji
- 👤 Kenji Ochiai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:02
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/02; H01B1/026; C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/51; C04B41/5127; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H10; H10W; H10W20/00; H10W20/40; H10W72/00; H10W72/30; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
An electrically conductive paste comprising (i) 60 to 90 wt % of metal fine powders which comprise a silver fine powder having a particle size of 10 μm or less and a composite fine powder of silver and copper having a particle size of 10 μm or less, the copper content in the metal fine powders being 0.1 to 10 wt %, and (ii) 10 to 40 wt % of a vehicle component.
Claim 2
Dependent Claim
73 words
An electrically conductive paste comprising (i) 60 to 90 wt % of metal fine powders which comprise a silver fine powder having a particle size of 10 μm or less and a composite fine powder of silver and copper having a particle size of 10 μm or less, the copper content in the metal fine powders being 0.1 to 10 wt %, and (ii) 10 to 40 wt % of a vehicle component.
Claim 3
Dependent Claim
42 words
An electrically conductive paste according to claim 1, wherein the metal fine powders further contain a composite fine powder of silver and platinum or a platinum fine powder, the platinum content in the metal fine powders being 0.2 to 10 wt %.
Claim 4
Dependent Claim
42 words
An electrically conductive paste according to claim 1, wherein the metal fine powders further contain a composite fine powder of silver and palladium or a palladium fine powder, the palladium content in the metal fine powders being 0.2 to 30 wt %.
Claim 5
Dependent Claim
23 words
An electrically conductive paste according to claim 1, wherein the copper content in the metal fine powders is 2 to 5 wt %.
Claim 6
Dependent Claim
25 words
An electrically conductive paste according to claim 1, wherein the metal fine powder content in the electrically conductive paste is 75 to 82 wt %.
Claim 7
Dependent Claim
27 words
An electrically conductive paste according to claim 1, wherein the vehicle component is selected from the group consisting of terpineol, butylcarbitol, ethyl cellulose, butylcarbitol acetate and 2,2,4-trimethylpentanediol-1,3-monoisobutyrate.
Claim 8
Dependent Claim
23 words
An electrically conductive paste according to claim 2, wherein the platinum content in the metal fine powders is 0.5 to 3 wt %.
Claim 9
Dependent Claim
26 words
An electrically conductive paste according to claim 2, wherein the composite fine powder of silver and platinum has a particle size of 10 μm or less.
Claim 10
Dependent Claim
23 words
An electrically conductive paste according to claim 3, wherein the palladium content in the metal fine powders is 0.5 to 10 wt %.
Claim 11
Dependent Claim
26 words
An electrically conductive paste according to claim 3, wherein the composite fine powder of silver and palladium has a particle size of 10 μm or less.
Claim 12
Dependent Claim
23 words
An electrically conductive paste according to claim 3, wherein the palladium fine powder has a particle size of not more than 5 μm.
Claim 13
Dependent Claim
23 words
An electrically conductive paste according to claim 11, wherein the palladium fine powder has an average particle size of 2 μm or less.
Claim 14
Dependent Claim
29 words
An electrically conductive paste according to claim 1, wherein said metal fine powders consist essentially of said silver fine powder and said composite fine powder of silver and copper.
References Cited (Backward Citations)
US3846345A
Cited
US3799891A
Cited
US3929491A
Cited
US3918980A
Cited
US4414143A
Cited
US4400214A
Cited
US4466830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |