US4943477A
Expired / Lapsed
US
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Conductive sheet having electromagnetic interference shielding function
Assignee: Mitsubishi Chemical Corp
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Filing: 1988-09-27
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Granted: 1990-07-24
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Expires: 2008-09-27
Abstract
Abstract A conductive sheet is disclosed, which consists of a nonwoven fabric consisting of 40 to 90 wt % of a heat fusible fiber comprising a vinyl chloride/vinyl acetate copolymer and 10 to 60 wt % of a metal-plated fiber having a fiber diameter of 3 to 50 mu m and an aspect ratio of 1,000 to 10,000, wherein the nonwoven fabric is hot-press molded and wherein the conductive sheet has a metal content of 2 to 30% by weight and a specific volume of at most 2 cm3/g. The conductive sheet has excellent electromagnetic interference shielding and electrical control effects.
Inventors
- 👤 Tomotsugu Kanamura
- 👤 Toshihiko Shibata
- 👤 Yasuji Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:12
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4209; D04H1/4234; D04H1/4282; D04H1/4291; D04H1/4382; D04H1/43835; H01; H01B; H01B1/00; H01B1/20; H01B1/22; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/611; Y10T442/654; Y10T442/655
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
A conductive sheet having an electromagnetic interference shielding function, which consists of a nonwoven fabric consisting of 40 to 90 wt% of a heat fusible fiber comprising a vinyl chloride/vinyl acetate copolymer and 10 to 60 wt% of a metal-plated fiber having a fiber diameter of 3 to 50 μm and an aspect ratio of 1,000 to 10,000, wherein said nonwoven fabric is hot-press molded and wherein said conductive sheet has a metal content of 2 to 30% by weight and a specific volume of at most 2 cm 3 /g.
Claim 2
Dependent Claim
91 words
A conductive sheet having an electromagnetic interference shielding function, which consists of a nonwoven fabric consisting of 40 to 90 wt% of a heat fusible fiber comprising a vinyl chloride/vinyl acetate copolymer and 10 to 60 wt% of a metal-plated fiber having a fiber diameter of 3 to 50 μm and an aspect ratio of 1,000 to 10,000, wherein said nonwoven fabric is hot-press molded and wherein said conductive sheet has a metal content of 2 to 30% by weight and a specific volume of at most 2 cm 3 /g.
Claim 3
Dependent Claim
28 words
A conductive sheet as in claim 1, wherein said metal-plated fiber has a fiber diameter of 5 to 20 μm and an aspect ratio of 2,000 to 6,000.
Claim 4
Dependent Claim
23 words
A conductive sheet as in claim 1, wherein said metal-plated fiber is produced by electroless plating a base fiber with a conductive metal.
Claim 5
Dependent Claim
15 words
A conductive sheet as in claim 3, wherein the base fiber is an acrylic fiber.
Claim 6
Dependent Claim
17 words
A conductive sheet as in claim 4, wherein the acrylic fiber is an acrylonitrile/vinylidene chloride copolymer fiber.
Claim 7
Dependent Claim
21 words
A conductive sheet as in claim 3, wherein the conductive metal is selected from the group consisting of nickel and copper.
Claim 8
Dependent Claim
34 words
A conductive sheet as in claim 3, wherein the ratio of the conductive metal for plating on the base fiber is in the range of 10 to 50% by weight of the metal-plated fiber.
Claim 9
Dependent Claim
16 words
A conductive sheet as in claim 3, wherein the base fiber possesses a flat cross section.
Claim 10
Dependent Claim
31 words
A conductive sheet as in claim 1, wherein said heat fusible fiber consists of 85 to 88% by weight of vinyl chloride and 12 to 15% by weight of vinyl acetate.
Claim 11
Dependent Claim
21 words
A conductive sheet as in claim 1, wherein at least one side of said conductive sheet is made into a film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |