US4991060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board having conductors interconnected by foamed electroconductive paste
Assignee: Nippon CMK Corp
•
Filing: 1989-11-24
•
Granted: 1991-02-05
•
Expires: 2009-11-24
Abstract
Abstract A printed circuit board has a vibration-absorbing electroconductive body disposed in a through-hole to electrically interconnect electrical conductors disposed on opposed sides of the board. The electroconductive body is formed from the expansion of a decomposed, foamed electroconductive paste which is heated and hardened to form the electroconductive body.
Inventors
- 👤 Shin Kawakami
- 👤 Satoshi Haruyama
- 👤 Hirotaka Okonogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:22
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/40; H05K3/4038; H05K3/4053; H05K3/4069; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0116; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/09563; H05K2203/00; H05K2203/14; H05K2203/1453; H05K3/22; H05K3/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
A printed circuit board comprising: an insulating substrate having a pair of opposed major surfaces and a through-hole extending therethrough from one major surface to the other major surface; a first conductor disposed on one major surface of the substance in the region of the through-hole; a second conductor disposed on the other major surface of the substrate in the region of the through-hole; and a foamed electroconductive paste disposed in the through-hole and extending outwardly thereof and overlying portions of the first and second conductors in the region of the through-hole, the foamed electroconductive paste electrically interconnecting the first and second conductors and being effective to absorb external shocks applied to the substrate.
Claim 2
Dependent Claim
114 words
A printed circuit board comprising: an insulating substrate having a pair of opposed major surfaces and a through-hole extending therethrough from one major surface to the other major surface; a first conductor disposed on one major surface of the substance in the region of the through-hole; a second conductor disposed on the other major surface of the substrate in the region of the through-hole; and a foamed electroconductive paste disposed in the through-hole and extending outwardly thereof and overlying portions of the first and second conductors in the region of the through-hole, the foamed electroconductive paste electrically interconnecting the first and second conductors and being effective to absorb external shocks applied to the substrate.
Claim 3
Dependent Claim
30 words
A printed circuit board according to claim 1 wherein the foamed electroconductive paste comprises an expanded foamed paste having a volume at least twice the original volume thereof before expansion.
Claim 4
Dependent Claim
15 words
A printed circuit board according to claim 2; wherein the foamed electroconductive paste includes copper.
Claim 5
Dependent Claim
25 words
A printed circuit board according to claim 1; wherein the first and second conductors define predetermined patterns on the opposed major surfaces of the substrate.
References Cited (Backward Citations)
US4683653A
Cited
US4885662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |