Patent US4582729A successfully refreshed from Google Patents.
US4582729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for electro-magnetic interference shielding
Assignee: Shipley Co Inc
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Filing: 1983-06-30
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Granted: 1986-04-15
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Expires: 2003-06-30
Abstract
Abstract A process for metal plating plastic or elastomeric materials which produces a coating of high conductivity which does not reduce over time is disclosed in this application to provide electro-magnetic interference shielding for said materials. This process uses either a particular special plating bath containing stabilizer additions with any surface preparation technique, or a certain specific surface preparation technique along with the use of a standard plating bath or the special stabilized plating bath to obtain metal coatings with the desired properties.
Inventors
- 👤 Chris Tsiamis
- 👤 John E. McCaskie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:23
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/32; C23C18/34; C23C18/36; C23C18/18; C23C18/20; C23C18/22; C23C18/28
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
77 words
A process for EMI shielding of plastic or elastomeric materials which comprises: (a) catalytically activating the surface of said material; and (b) plating said activated surface with an electroless metal plating bath that contains a sufficient amount of (1) an organic compound having a thiocarbonyl group, and (2) a complexing agent, to provide a metal coating which has a surface resistivity of less than about one ohm/square both initially and after aging for at least one month.
Claim 2
Dependent Claim
77 words
A process for EMI shielding of plastic or elastomeric materials which comprises: (a) catalytically activating the surface of said material; and (b) plating said activated surface with an electroless metal plating bath that contains a sufficient amount of (1) an organic compound having a thiocarbonyl group, and (2) a complexing agent, to provide a metal coating which has a surface resistivity of less than about one ohm/square both initially and after aging for at least one month.
Claim 3
Dependent Claim
13 words
The process according to claim 1 in which the organic compound is thio-urea.
Claim 4
Dependent Claim
21 words
The process according to claim 1 in which the surface of the material is etched prior to catalytically activating the surface.
Claim 5
Dependent Claim
16 words
The process according to claim 3 in which the material is etched with gaseous sulfur trioxide.
Claim 6
Dependent Claim
21 words
The process according to claim 2 in which the surface of the material is etched prior to catalytically activating the surface.
Claim 7
Dependent Claim
16 words
The process according to claim 5 in which the material is etched with gaseous sulfur trioxide.
Claim 8
Dependent Claim
22 words
The process according to claim 1 wherein said electroless plating bath contains at least 25 parts by weight of a citrate compound.
Claim 9
Dependent Claim
20 words
The process according to claim 2 in which the electroless both contain at least 25 parts by weight of citrate.
Claim 10
Dependent Claim
15 words
The process according to claim 1 wherein said metal plating bath and coating is nickel.
Claim 11
Dependent Claim
86 words
A process for EMI shielding of plastic or elastomeric materials which comprises: (a) catalytically activating the surface of said material; and (b) plating said activated surface with an electroless metal plating bath that contains (1) up to about 10 mg/l of an organic compound having a thiocarbonyl group, and (2) between about 25 and 60 g/l of a complexing agent to provide a metal coating which has a surface resistivity of less than about one ohm/square both initially and after aging for at least one month.
Claim 12
Dependent Claim
86 words
A process for EMI shielding of plastic or elastomeric materials which comprises: (a) catalytically activating the surface of said material; and (b) plating said activated surface with an electroless metal plating bath that contains (1) up to about 10 mg/l of an organic compound having a thiocarbonyl group, and (2) between about 25 and 60 g/l of a complexing agent to provide a metal coating which has a surface resistivity of less than about one ohm/square both initially and after aging for at least one month.
Claim 13
Dependent Claim
12 words
The process according to claim 10 wherein said organic compound is thiourea.
Claim 14
Dependent Claim
14 words
The process according to claim 11 wherein said complexing agent is a citrate compound.
Claim 15
Dependent Claim
15 words
The process according to claim 12 wherein said metal plating bath and coating is nickel.
Claim 16
Dependent Claim
14 words
The process according to claim 13 wherein said surface is etched prior to activation.
Claim 17
Dependent Claim
15 words
The process according to claim 14 wherein said surface is etched with gaseous sulfur trioxide.
Claim 18
Dependent Claim
14 words
The process according to claim 15 wherein said thiourea concentration is about 1-2 mg/l.
Claim 19
Dependent Claim
15 words
The process according to claim 16 wherein said citrate compound concentration is about 30 g/l.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |