US4576859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio wave shielding materials and a method of producing the same
Assignee: Bridgestone Corp
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Filing: 1984-10-22
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Granted: 1986-03-18
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Expires: 2004-10-22
Abstract
Abstract A radio wave shielding material and a method of producing the same are disclosed. The radio wave shielding material comprises a plastic foamed body of three-dimensional network skeleton structure, a metal plating coat formed on the skeleton surface, and a coating of conductive rubber and/or plastic formed on the metal plating coat.
Inventors
- 👤 Tomio Oyachi
- 👤 Hiroya Fukuda
- 👤 Masahiko Anami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:57
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/0015; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249962; Y10T428/249967; Y10T428/24997
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A radio wave shielding material comprising a plastic foamed body having a three-dimensional network skeleton structure and provided on its skeleton surface with a metal plating coat, and a coating of a conductive rubber and/or plastic formed on said metal plating coat.
Claim 2
Dependent Claim
42 words
A radio wave shielding material comprising a plastic foamed body having a three-dimensional network skeleton structure and provided on its skeleton surface with a metal plating coat, and a coating of a conductive rubber and/or plastic formed on said metal plating coat.
Claim 3
Dependent Claim
42 words
A radio wave shielding material according to claim 1, wherein said plastic foamed body is an open-cell polyurethane foam of three-dimensional network skeleton structure having such a porosity that an average cell number per 25 mm of straight line is 10-40 cells.
Claim 4
Dependent Claim
24 words
A radio wave shielding material according to claim 1, wherein said plastic foamed body has a volume resistivity of not more than 100 Ω·cm.
Claim 5
Dependent Claim
21 words
A radio wave shielding material according to claim 1, wherein said metal plating coat is nickel or nickel alloy plating coat.
Claim 6
Dependent Claim
22 words
A radio wave shielding material according to claim 1, wherein said metal plating coat has a thickness of not more than 6μ.
Claim 7
Dependent Claim
29 words
A radio wave shielding material according to claim 1, wherein said conductive rubber and/or plastic is selected from conductive silicone rubber, conductive acrylic rubber and modified conductive acrylic rubber.
Claim 8
Dependent Claim
27 words
A radio wave shielding material according to claim 1, wherein said coating of conductive rubber and/or plastic has a volume resistivity of not more than 100 Ω·cm.
Claim 9
Dependent Claim
32 words
A radio wave shielding material according to claim 1, wherein said material is provided on at least one surface with a release paper through a bonding agent locally or wholly applied thereto.
Claim 10
Independent Claim
85 words
A method of producing a radio wave shielding material, which comprises: forming a metal plating coat on a surface of a plastic foamed body having a three-dimensional network skeleton structure; impregnating or applying a liquid composition containing a conductive rubber and/or plastic to said plastic foamed body; subjecting said body to a compression deformation to squeeze out an excess amount of said liquid composition while said metal plating coat is partially broken to provide a proper compression modulus; and curing said conductive rubber and/or plastic.
Claim 11
Independent Claim
85 words
A method of producing a radio wave shielding material, which comprises: forming a metal plating coat on a surface of a plastic foamed body having a three-dimensional network skeleton structure; impregnating or applying a liquid composition containing a conductive rubber and/or plastic to said plastic foamed body; subjecting said body to a compression deformation to squeeze out an excess amount of said liquid composition while said metal plating coat is partially broken to provide a proper compression modulus; and curing said conductive rubber and/or plastic.
Claim 12
Dependent Claim
18 words
A method according to claim 9, wherein said metal plating coat is formed by an electroless plating process.
Claim 13
Dependent Claim
22 words
A method according to claim 10, wherein said plastic foamed body is subjected to a surface treatment prior to said electroless plating.
Claim 14
Dependent Claim
16 words
A method according to claim 9, wherein said compression deformation is a compression strain of 10-90%.
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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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |