Patent US4578310A successfully refreshed from Google Patents.
US4578310A
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Method of producing adherent metallic film
Assignee: MICHAEL LADNEY GROSSE POINTE SHORES MICHIGAN
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Filing: 1985-07-22
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Granted: 1986-03-25
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Expires: 2005-07-22
Abstract
Abstract A method of producing an adherent metallic film for a thermoplastic or thermoset polymeric substrate to provide radio frequency shielding of electromagnetic interference. The polymeric substrate is prepared for application of the metallic film by application of a primer. The primer is an organic-based coating having a dispersion of silica gel to enhance the microscopic surface area and improve adhesion. The silica gel has an average particle size of approximately 20 microns and forms 2-10% of the mixture by weight. A catalyst may be added to the primer to promote curing. The metallic film is preferably zinc and may be applied by either flame or arc spraying technique, or electroless plating of the primed surface.
Inventors
- 👤 Raymond W. Hatfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:46
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/02; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/2006; C23C18/2046; C23C18/2073; C23C18/208; C23C18/28; C23C18/285; C23C18/30; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31551; Y10T428/31605; Y10T428/31652; Y10T428/31667; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
44 words
A method of producing an electromagnetic interference shield on a plastic substrate comprising the steps of: a. priming the surface of the substrate by applying an organic-based coating containing a dispersion of silica gel; and b. applying a metallic film onto the primed surface.
Claim 2
Independent Claim
44 words
A method of producing an electromagnetic interference shield on a plastic substrate comprising the steps of: a. priming the surface of the substrate by applying an organic-based coating containing a dispersion of silica gel; and b. applying a metallic film onto the primed surface.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein step b. comprises spraying the metallic film onto the surface.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein the metallic film is sprayed by an arc spraying process.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the substrate is primed by spraying the mixture onto the surface.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the substrate surface is primed to a thickness in the range of 1-5 mils.
Claim 7
Dependent Claim
24 words
The method of claim 1 further including a preparatory step of agitating the mixture to uniformly disperse the silica gel throughout the organic-based coating.
Claim 8
Dependent Claim
29 words
The method of claim 1 further including a preparatory step of adding a catalyst to the mixture to promote curing of the organic-based coating when applied to the substrate.
Claim 9
Dependent Claim
11 words
The method of claim 7 wherein the catalyst is an isocyanate.
Claim 10
Dependent Claim
23 words
The method of claim 1 wherein step a. includes the sub-step of curing the applied mixture prior to application of the metallic film.
Claim 11
Dependent Claim
21 words
The method of claim 9 wherein the curing sub-step is performed by air drying at ambient for approximately one half hour.
Claim 12
Dependent Claim
21 words
The method of claim 9 wherein the curing sub-step is performed by subjecting the substrate to 120°-160° F. for 15-20 minutes.
Claim 13
Dependent Claim
14 words
The method of claim 1 wherein the mixture contains 2-10% silica gel by weight.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein the metallic film is applied by electroless plating.
Claim 15
Dependent Claim
25 words
An article for shielding electromagnetic interference made in accordance with claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13.
Claim 16
Dependent Claim
41 words
A composite article for shielding emission of electromagnetic interference comprising: a plastic substrate; a primer applied to the substrate and comprising a mixture of an organic-based coating with a dispersion of silica gel; and a metallic film applied to the substrate.
Claim 17
Dependent Claim
41 words
A composite article for shielding emission of electromagnetic interference comprising: a plastic substrate; a primer applied to the substrate and comprising a mixture of an organic-based coating with a dispersion of silica gel; and a metallic film applied to the substrate.
Claim 18
Dependent Claim
13 words
The composite article of claim 15 wherein the metallic film is of zinc.
Claim 19
Dependent Claim
13 words
The composite article of claim 15 wherein the metallic film is of copper.
Claim 20
Dependent Claim
15 words
The composite article of claim 15 wherein the mixture contains 2-10% silica gel by weight.
Claim 21
Dependent Claim
21 words
The composite article of claim 15 wherein the mixture further comprises a catalyst to promote curing of the organic based coating.
Claim 22
Dependent Claim
12 words
The composite article of claim 15 wherein the catalyst is a urethane.
Claim 23
Dependent Claim
17 words
The composite article of claim 15 wherein the primer is applied to a thickness of 1-5 mils.
Claim 24
Dependent Claim
19 words
The composite article of claim 15 wherein the silica gel has an average particle size of about 20 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |