US5851644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Films and coatings having anisotropic conductive pathways therein
Assignee: Henkel Loctite Ireland Ltd
•
Filing: 1996-07-25
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Granted: 1998-12-22
•
Expires: 2016-07-25
Abstract
Abstract An anisotropically-conductive film or a substrate having a surface coated with an anisotropically-conductive coating, said film or coating being formed by solidifying a composition comprising (i) a solidifiable ferrofluid composition, the ferrofluid comprising a colloidal suspension of ferromagnetic particles in a non-magnetic carrier, and (ii) a plurality of electrically-conductive particles, dispersed in the ferrofluid, the electrically-conductive particles having been arrayed in a non-random pattern by application of a substantially uniform magnetic field to the composition in a liquid state and having been locked in position by solidification of the composition. The composition is solidified in an A-stage, usually involving a primary cure. In end-use application of the film or coating, the composition usually undergoes a B-stage or secondary cure. The film or coated substrate is an article of manufacture for bonding conductors in the electronics industry.
Inventors
- 👤 Ciaran B. McArdle
- 👤 Joseph Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:25
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; H05K3/323; H01; H01F; H01F41/00; H01F41/14; H01F41/16; H01R; H01R4/00; H01R4/04; H05K2201/00; H05K2201/08; H05K2201/083; H05K2203/00; H05K2203/10; H05K2203/104; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/25; Y10T428/256; Y10T428/257
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
115 words
An anisotropically-conductive film or a substrate having a surface coated with an anisotropically-conductive coating, said film or coating having been formed by solidifying a solidifiable ferrofluid composition, the solidifiable ferrofluid composition comprising (i) a colloidal suspension of ferromagnetic particles in a non-magnetic carrier, and (ii) a plurality of electrically-conductive particles dispersed in the ferrofluid composition, said electrically-conductive dispersed particles having an average particle size which is about 10 times or more than the particle size of said ferromagnetic particles, said electrically-conductive particles having been arrayed in a non-random pattern by application of a substantially uniform magnetic field to the composition in a liquid state and having been locked in position by solidification of the composition.
Claim 2
Dependent Claim
115 words
An anisotropically-conductive film or a substrate having a surface coated with an anisotropically-conductive coating, said film or coating having been formed by solidifying a solidifiable ferrofluid composition, the solidifiable ferrofluid composition comprising (i) a colloidal suspension of ferromagnetic particles in a non-magnetic carrier, and (ii) a plurality of electrically-conductive particles dispersed in the ferrofluid composition, said electrically-conductive dispersed particles having an average particle size which is about 10 times or more than the particle size of said ferromagnetic particles, said electrically-conductive particles having been arrayed in a non-random pattern by application of a substantially uniform magnetic field to the composition in a liquid state and having been locked in position by solidification of the composition.
Claim 3
Dependent Claim
32 words
A film or coated substrate according to claim 1 wherein the solidifiable ferrofluid composition was curable and comprised at least a primary cure system which had been activated to solidify said composition.
Claim 4
Dependent Claim
36 words
A film or coated substrate according to claim 2 wherein the composition contains a latent cure system which is activatable to further cure said film or coating at a time subsequent to solidification of the composition.
Claim 5
Dependent Claim
20 words
A film or coated substrate according to claim 1 wherein the electrically conductive particles have substantially uniform sizes and shapes.
Claim 6
Dependent Claim
28 words
A film or coated substrate according to claim 4, wherein said film or coating has a thickness is substantially equal to the average diameter of the electrically-conductive particles.
Claim 7
Dependent Claim
117 words
An anisotropically-conductive film or substrate coating formed by (a) applying to a substrate, a layer of a solidifiable ferrofluid composition comprising a colloidal suspension of ferromagnetic particles in a non-magnetic carrier liquid, and a plurality of electrically-conductive particles, dispersed in the ferrofluid composition, the electrically-conductive particles having an average particle size about 10 times or more than that of said ferromagnetic particles; (b) exposing the solidifiable ferrofluid composition to a magnetic field to array the electrically-conductive particles in a non-random pattern; (c) concurrent with or subsequent to step (b), exposing the solidifiable ferrofluid composition to solidifying conditions for the composition; and (d) optionally removing the layer of solidified ferrofluid composition from the substrate to form a film.
Claim 8
Dependent Claim
117 words
An anisotropically-conductive film or substrate coating formed by (a) applying to a substrate, a layer of a solidifiable ferrofluid composition comprising a colloidal suspension of ferromagnetic particles in a non-magnetic carrier liquid, and a plurality of electrically-conductive particles, dispersed in the ferrofluid composition, the electrically-conductive particles having an average particle size about 10 times or more than that of said ferromagnetic particles; (b) exposing the solidifiable ferrofluid composition to a magnetic field to array the electrically-conductive particles in a non-random pattern; (c) concurrent with or subsequent to step (b), exposing the solidifiable ferrofluid composition to solidifying conditions for the composition; and (d) optionally removing the layer of solidified ferrofluid composition from the substrate to form a film.
Claim 9
Dependent Claim
59 words
A solid-form anisotropically-conductive film or a substrate having a surface coated with a solid-form anisotropically-conductive coating, said film or coating comprising a composition containing colloidal ferromagnetic particles and a plurality of electrically-conductive particles having an average particle size which is about 10 times or more than that of the ferromagnetic particles arrayed in the composition in a non-random pattern.
Claim 10
Dependent Claim
59 words
A solid-form anisotropically-conductive film or a substrate having a surface coated with a solid-form anisotropically-conductive coating, said film or coating comprising a composition containing colloidal ferromagnetic particles and a plurality of electrically-conductive particles having an average particle size which is about 10 times or more than that of the ferromagnetic particles arrayed in the composition in a non-random pattern.
Claim 11
Dependent Claim
28 words
A film or coated substrate according to claim 7 wherein the composition contains a latent cure system which is activatable to cure said solid-form anisotropically-conductive film or coating.
Claim 12
Dependent Claim
22 words
A substrate having conductors thereon, and having an anisotropically conductive film or coating as defined in claim 1 applied to said conductors.
Claim 13
Dependent Claim
24 words
A substrate according to claim 9 wherein the anisotropically-conductive coating contains a latent cure system which is activatable to cure said film or coating.
Claim 14
Dependent Claim
19 words
A film or coated substrate according to claim 1 wherein the electrically conductive particles are arrayed in a monolayer.
Claim 15
Dependent Claim
19 words
A film or substrate coating according to claim 6 wherein the electrically conductive particles are arrayed in a monolayer.
Claim 16
Dependent Claim
19 words
A film or coated substrate according to claim 7 wherein the electrically conductive particles are arrayed in a monolayer.
Claim 17
Dependent Claim
17 words
A film or coated substrate according to claim 1 wherein the electrically conductive particles are substantially non-magnetic.
Claim 18
Dependent Claim
17 words
A film or substrate coating according to claim 6 wherein the electrically conductive particles are substantially non-magnetic.
Claim 19
Dependent Claim
17 words
A film or coated substrate according to claim 7 wherein the electrically conductive particles are substantially non-magnetic.
Claim 20
Dependent Claim
35 words
A film or coated substrate according to claim 1 wherein the composition contains a latent cure system which is activatable to cure said film or coating at a time subsequent to solidification of the composition.
Claim 21
Dependent Claim
93 words
An anisotropically-conductive film or a substrate having a surface coated with an anisotropically-conductive coating, said film or coating having been formed by solidifying a solidifiable ferrofluid composition, the solidifiable ferrofluid composition comprising (i) a colloidal suspension of ferromagnetic particles in a non-magnetic carrier, and (ii) a plurality of electrically-conductive substantially non-magnetic particles dispersed in the ferrofluid composition, said electrically-conductive particles having been arrayed in a non-random pattern by application of a substantially uniform magnetic field to the composition in a liquid state and having been locked in position by solidification of the composition.
Claim 22
Dependent Claim
93 words
An anisotropically-conductive film or a substrate having a surface coated with an anisotropically-conductive coating, said film or coating having been formed by solidifying a solidifiable ferrofluid composition, the solidifiable ferrofluid composition comprising (i) a colloidal suspension of ferromagnetic particles in a non-magnetic carrier, and (ii) a plurality of electrically-conductive substantially non-magnetic particles dispersed in the ferrofluid composition, said electrically-conductive particles having been arrayed in a non-random pattern by application of a substantially uniform magnetic field to the composition in a liquid state and having been locked in position by solidification of the composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-21 | 2002-06-22 | 2002-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-21 | 2006-06-22 | 2006-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-21 | 2010-06-22 | 2010-12-22 | $7700.00 | Window Closed / Lapsed |