EP0302631A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Composite electrical interconnection medium
Assignee: AT&T Inc
•
Filing: 1988-07-21
•
Granted: —
•
Expires: 2008-07-21
Abstract
Abstract An electrical interconnection medium is made as a composite of electrically conducting, magnetic particles (11) in a nonconductive matrix material (12). Particles are magnetically aligned into a network which extends in at least two dimensions as, e.g., in a sheet or layer medium. A layer medium may further include additional larger conductive particles (21) which may be magnetically aligned into columns extending the thickness of the medium; typically, in this case, the medium serves as an anisotropically conductive medium in the direction of the columns, with slight in-plane conductivity imparted by the network aiding the dissipation of electrostatic charge.
Inventors
- 👤 Sungho Jin
- 👤 William Roger Lambert
- 👤 Robert Clark Moore
- 👤 John Joseph Mottine, Jr.
- 👤 Richard Curry Sherwood
- 👤 Thomas Henry Tiefel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 05:49
CPC Classifications
H; H01; H01R; H01R4/00; H01R4/04; H01B; H01B1/00; H01B1/20; H01B1/22; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/4913; Y10T428/00; Y10T428/249921; Y10T428/25; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
67 words
An electrical interconnection medium comprising a body of composite material, said composite material comprising first particles (11) in a substantially nonconductive matrix material (12), said first particles comprising magnetic material and having at least a surface portion which is electrically conducting, CHARACTERISED IN THAT said first particles are magnetically aligned into a conductive network, whereby said medium has significant conductivity at least in two mutually perpendicular directions.
Claim 2
Dependent Claim
67 words
An electrical interconnection medium comprising a body of composite material, said composite material comprising first particles (11) in a substantially nonconductive matrix material (12), said first particles comprising magnetic material and having at least a surface portion which is electrically conducting, CHARACTERISED IN THAT said first particles are magnetically aligned into a conductive network, whereby said medium has significant conductivity at least in two mutually perpendicular directions.
Claim 3
Dependent Claim
30 words
An electrical interconnection medium as claimed in claim 1, said first particles being present in said medium in an amount in the range from 0.5 to 30 percent by volume.
Claim 4
Dependent Claim
27 words
An electrical interconnection medium as claimed in claim 1 or claim 2, the diameter of said first particles being in the range from 0.5 to 10 micrometers.
Claim 5
Dependent Claim
22 words
An electrical interconnection medium as claimed in any of the preceding claims, said medium having the form of a layer or sheet.
Claim 6
Dependent Claim
27 words
An electrical interconnection medium as claimed in claim 4, said medium having x-y conductivity less than 1 ohm-centimeter, the z-axis being perpendicular to the layer or sheet.
Claim 7
Dependent Claim
18 words
An electrical interconnection medium as claimed in claim 5, said medium having z-direction conductivity less than 1 ohm-centimeter.
Claim 8
Dependent Claim
25 words
An electrical interconnection medium as claimed in claim 4, said medium having an insulating layer at least at one surface of said layer or sheet.
Claim 9
Dependent Claim
27 words
An electrical interconnection medium as claimed in claim 4, said medium further comprising second particles (21) providing for conductivity across the thickness of said layer or sheet.
Claim 10
Dependent Claim
23 words
An electrical interconnection medium as claimed in claim 8, said second particles comprising magnetic material and being magnetically aligned into mutually separated columns.
Claim 11
Dependent Claim
27 words
An electrical interconnection medium as claimed in claim 8 or claim 9 the diameter of said second particles being in the range from 10 to 100 micrometers.
Claim 12
Dependent Claim
30 words
An electrical interconnection medium as claimed in any of claims 8 to 10, the in-plane resistivity of said layer or sheet being in the range from 10⁴ to 10¹² ohm-centimeters.
Claim 13
Dependent Claim
29 words
An electrical interconnection medium as claimed in any of claims 8 to 11, the ratio of perpendicular resistivity and in-plane resistivity being in the range from 10⁻⁷ to 10⁻¹⁵.
Claim 14
Dependent Claim
88 words
An assembly comprising a first device (41) and a second device (42), said first device having a first electrical contact (411,412,413) said second device having a second electrical contact (421,422,423) at least a first portion of said first electrical contact facing at least a second portion of said second electrical contact, and at least a part of the space between said first portion and said second portion being occupied by an electrical interconnection medium (43) as claimed in any of claims 1 to 6 or 8 to 12.
Claim 15
Independent Claim
47 words
A method for making a medium as claimed in any of claims 1 to 12, said method comprising: dispersing said particles in a soft form or precursor of said material: applying magnetic fields in a plurality of directions to provide said alignment; and hardening said matrix material.
Claim 16
Independent Claim
72 words
A method for device quality assurance in the manufacture of electrical devices, said method including a step of establishing electrical connection between contacts on the device to be tested and corresponding contacts on a test set, said electrical connection being established via an interconnection medium as claimed in any of claims 1 to 4 or 8 to 12, the conductivity of the medium being sufficient for static-charge dissipation in two perpendicular directions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.