Patent US4874548A successfully refreshed from Google Patents.
US4874548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive adhesive
Assignee: Ameron Inc
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Filing: 1988-03-14
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Granted: 1989-10-17
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Expires: 2008-03-14
Abstract
Abstract An electrically conductive adhesive composition comprises an epoxy resin and stainless steel fibers, or other conductive fibers, having a length of about 4 mm to about 8 mm at a concentration of less 5% by weight. It is preferred that the stainless steel fibers have a length of about 6 mm and a diameter of about 2 mu m to about 20 mu m, and are present in a concentration of from about 0.7% by weight to about 1.5% by weight. The primary purpose of the adhesive is to continue conductivity across bonds in systems designed to prevent build-up and storage of static electrical charges.
Inventors
- 👤 Robert J. Hajovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:48
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; C08J7/043; C08J7/044; H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24; C08J2363/00; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
46 words
An electrically conductive adhesive composition comprising a curable thermosetting resin and conductive fibers in a concentration of from about 0.7 to less than about five percent by weight of the composition, the conductive fibers each having a length of from about 4 to about 8 millimeters.
Claim 2
Dependent Claim
46 words
An electrically conductive adhesive composition comprising a curable thermosetting resin and conductive fibers in a concentration of from about 0.7 to less than about five percent by weight of the composition, the conductive fibers each having a length of from about 4 to about 8 millimeters.
Claim 3
Dependent Claim
23 words
A composition as claimed in claim 1 in which the concentration of conductive fibers is from about 0.7 to about 1.5% by weight.
Claim 4
Dependent Claim
17 words
A composition as claimed in claim 1 in which the fibers are about 6 mm in length.
Claim 5
Dependent Claim
15 words
A composition as claimed in claim 1 wherein the conductive fibers are stainless steel fibers.
Claim 6
Dependent Claim
25 words
A composition as claimed in claim 4 in which the stainless steel fibers have a diameter of from about 2 μm to about 20 μm.
Claim 7
Dependent Claim
18 words
A composition as claimed in claim 4 in which the diameter of the fibers is about 8 μm.
Claim 8
Dependent Claim
18 words
A composition as claimed in claim 1 in which the curable thermosetting resin is a curable epoxy resin.
Claim 9
Dependent Claim
23 words
A composition as claimed in claim 7 in which the curable epoxy resin comprises an epoxy resin blend and an adhesive hardener blend.
Claim 10
Dependent Claim
51 words
An electrically conductive adhesive composition comprising a curable epoxy resin and stainless steel fibers, said stainless steel fibers having a length of from about 4 mm to about 8 mm and being present in a concentration of from about 0.7 to not more than about 5% by weight of the composition.
Claim 11
Dependent Claim
51 words
An electrically conductive adhesive composition comprising a curable epoxy resin and stainless steel fibers, said stainless steel fibers having a length of from about 4 mm to about 8 mm and being present in a concentration of from about 0.7 to not more than about 5% by weight of the composition.
Claim 12
Dependent Claim
23 words
A composition as claimed in claim 9 in which the concentration of conductive fibers is from about 0.7 to about 1.5% by weight.
Claim 13
Dependent Claim
17 words
A composition as claimed in claim 9 in which the fibers are about 6 mm in length.
Claim 14
Dependent Claim
25 words
A composition as claimed in claim 9 in which the stainless steel fibers have a diameter of from about 2 μm to about 20 μm.
Claim 15
Dependent Claim
23 words
A composition as claimed in claim 9 in which the curable epoxy resin comprises an epoxy resin blend and an adhesive hardener blend.
Claim 16
Dependent Claim
28 words
A composition as claimed in claim 13 in which the weight ratio of the epoxy resin blend to the adhesive hardener blend is about 100 to about 75.
Claim 17
Dependent Claim
31 words
A composition as claimed in claim 13 in which the epoxy resin blend further comprises at least one filler selected from the group of thixotropic agents, thickening agents and coloring agents.
Claim 18
Dependent Claim
19 words
A composition as claimed in claim 13 in which the conductive fibers are present in the epoxy resin blend.
Claim 19
Dependent Claim
25 words
A composition as claimed in claim 13 in which the epoxy resin blend comprises an epoxy phenol novalac resin and a bisphenol A epoxy resin.
Claim 20
Dependent Claim
34 words
A composition as claimed in claim 13 in which the adhesive hardener blend comprises at least one curing agent selected from the group consisting of aminoethyl-piperazine, 4,4'-bis (para-aminocyclohexyl) methane, 1,2-diaminocyclohexane, dicyandiamide and mixtures thereof.
Claim 21
Dependent Claim
35 words
A composition as claimed in claim 13 in which the adhesive hardener blend further comprises at least one filler selected from the group consisting of toughening agents, thickening agents, coloring agents and gap filling agents.
Claim 22
Dependent Claim
119 words
A composition as claimed in claim 13 wherein: the epoxy resin blend comprises about 85 parts by weight epoxy phenol novalac resin, about 35 parts by weight bisphenol A epoxy resin, about 4 parts by weight glass fibers, about 3 parts by weight fumed silica, about 1 part by weight titanium dioxide pigment, and about 1.5 to about 2.5 parts by weight stainless steel fibers; and the adhesive hardener blend comprises about 30 parts by weight aminoethylpiperazine, about 30 parts by weight 4,4'-bis(para-aminocyclohexyl)methane, about 40 parts by weight 1,2-diaminocyclohexane, about 25 parts by weight epoxy novalac resin, about 2 parts by weight dicyandiamide, about 6 parts by weight fumed silica, and about 250 parts by weight silicon dioxide sand.
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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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |