US4831210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shields for electromagnetic radiation
Assignee: MacDermid Acumen Inc
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Filing: 1987-12-02
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Granted: 1989-05-16
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Expires: 2007-12-02
Abstract
Abstract Shielding means for electromagnetic radiation, particularly that of radio frequency, comprises a enclosure fabricated from non-conductive material and having on at least one of the interior or exterior walls a layer of copper metal. The latter has been applied by coating the surface of the wall with a suspension of particles of cuprous oxide (or like non-conductive metal derivatives capable of being reduced to conductive free metal) in a curable resinous material, at least partially curing the coating, reducing to free metal the cuprous oxide or like particles in the surface of the coating and then electrolessly plating the coating with copper.
Inventors
- 👤 Gary B. Larson
- 👤 Donald R. Ferrier
- 👤 Stanley J. Ruszczyk
- 👤 Steven A. Castaldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:31
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0084; G; G01; G01R; G01R1/00; G01R1/02; G01R1/18; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H05K9/0088; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
An enclosure adapted to attenuate electromagnetic radiation, said enclosure being fabricated from electrically non-conductive material and having on at least one of the inner and outer surfaces thereof an electromagnetic radiation attenuating layer of an electrically conductive metal, said layer having been derived by the steps of applying to said surface a coating of a suspension, in a curable resinous material, of particles of a non-conductive metal derivative capable of being chemically reduced to electrically conductive free metal; curing said coating; subjecting said coating to chemical reduction to convert at least a portion of the particles of said metal derivatives to free metal; and electrolessly plating the so treated coating with copper.
Claim 2
Dependent Claim
112 words
An enclosure adapted to attenuate electromagnetic radiation, said enclosure being fabricated from electrically non-conductive material and having on at least one of the inner and outer surfaces thereof an electromagnetic radiation attenuating layer of an electrically conductive metal, said layer having been derived by the steps of applying to said surface a coating of a suspension, in a curable resinous material, of particles of a non-conductive metal derivative capable of being chemically reduced to electrically conductive free metal; curing said coating; subjecting said coating to chemical reduction to convert at least a portion of the particles of said metal derivatives to free metal; and electrolessly plating the so treated coating with copper.
Claim 3
Dependent Claim
25 words
An enclosure according to claim 1 wherein the electrolessly plated copper layer is subsequently coated with a material which protects said copper layer against oxidation.
Claim 4
Dependent Claim
19 words
An enclosure according to claim 1 wherein the non-conductive metal derivative capable of being chemically reduced is cuprous oxide.
Claim 5
Dependent Claim
19 words
An enclosure according to claim 1 wherein the non-conductive metal derivative capable of being chemically reduced is cupric hydroxide.
Claim 6
Dependent Claim
19 words
An enclosure according to claim 1 wherein the non-conductive metal derivative capable of being chemically reduced is cupric carbonate.
Claim 7
Dependent Claim
26 words
An enclosure according to claim 1 wherein said particles of non-conductive metal derivative are reduced using an aqueous solution comprising dimethylaminoborane or an alkali metal borohydride.
Claim 8
Dependent Claim
19 words
An enclosure according to claim 6 wherein the reduction is carried out using an aqueous alkaline solution of dimethylaminoborane.
Claim 9
Dependent Claim
21 words
An enclosure according to claim 1 wherein the electrically non-conductive material from which the container is fabricated is a thermoplastic resin.
Claim 10
Dependent Claim
12 words
An enclosure according to claim 8 wherein said thermoplastic resin is ABS.
Claim 11
Dependent Claim
25 words
An enclosure according to claim 1 wherein the curable resinous material in which the particles of non-conductive metal derivative are suspended is a thermoset resin.
Claim 12
Dependent Claim
14 words
An enclosure according to claim 10 wherein said thermoset resin is an epoxy resin.
Claim 13
Dependent Claim
26 words
A method of attenuating electromagnetic radiation emitted by a source of such radiation said method comprising enclosing said source in an enclosure according to claim 1.
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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |