US5250342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite EMI shield having clean, highly conductive surfaces for conductive bonding
Assignee: RTX Corp
•
Filing: 1992-04-16
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Granted: 1993-10-05
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Expires: 2012-04-16
Abstract
Abstract An EMI shield is disclosed for providing EMI protection. The shield is lightweight, and easily moldable into complex shapes, having conductive mating surfaces provided on opposite sides thereof. The clean, highly conductive mating surfaces are part of an embedded aluminum wire mesh sandwiched between at least two face plies which add strength to the shield. By sandwiching the metal mesh alternately with a nonporous tape, and a barrier tape ply, clean conductive areas can be provided on either side of the shield, easing attachment to adjacent structures. During curing, the tapes prevent direct resin inclusion into the metal mesh. After curing, the nonporous tape is removed to expose the clean, highly conductive mating surfaces.
Inventors
- 👤 Charles F. Lang
- 👤 Rocco R. DiGenova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:54
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1438; Y10T428/24; Y10T428/24273; Y10T428/24298; Y10T428/24322; Y10T428/24331; Y10T428/24339; Y10T428/24347; Y10T428/24479; Y10T428/24562; Y10T428/28; Y10T428/2804; Y10T428/30; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31725; Y10T428/31736
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
69 words
A composite EMI shield comprising: at least one conductive layer for lightning or electromagnetic interference shielding; face plies on opposite sides of the conductive layer, each face ply having cutout areas to accommodate mating surfaces; barrier tape, placed behind the conductive layer, between the conductive layer and the corresponding face ply, complimentary to the cutout areas; and, removable nonporous tape placed in the cutout areas adjacent the face plies.
Claim 2
Dependent Claim
69 words
A composite EMI shield comprising: at least one conductive layer for lightning or electromagnetic interference shielding; face plies on opposite sides of the conductive layer, each face ply having cutout areas to accommodate mating surfaces; barrier tape, placed behind the conductive layer, between the conductive layer and the corresponding face ply, complimentary to the cutout areas; and, removable nonporous tape placed in the cutout areas adjacent the face plies.
Claim 3
Dependent Claim
18 words
The shield of claim 1 wherein said conductive layer comprises a conductive metal mesh or metal foil ply.
Claim 4
Dependent Claim
13 words
The shield of claim 1 wherein said conductive layer comprises aluminum metal mesh.
Claim 5
Dependent Claim
20 words
The shield of claim 1 wherein said face plies comprise fiberglass, graphite or polyaramid fiber reinforced, resin impregnated composite plies.
Claim 6
Dependent Claim
21 words
The shield of claim 1 wherein said nonporous tape comprises a copper foil with a polyester film facing and adhesive backing.
Claim 7
Dependent Claim
15 words
The shield of claim 1 wherein the barrier tape comprises a low flow film adhesive.
Claim 8
Dependent Claim
14 words
The shield of claim 1 wherein the barrier tape comprises a polyester film tape.
Claim 9
Dependent Claim
26 words
The shield of claim 1 further comprising one or more reinforcing plies placed between the barrier tape and the face ply to strengthen the mating surfaces.
Claim 10
Dependent Claim
20 words
The shield of claim 8 wherein said reinforcing plies comprise fiberglass, graphite or polyaramid fiber reinforced, resin impregnated composite plies.
Claim 11
Dependent Claim
93 words
A composite EMI shield comprising: two conductive sheets placed together to form a conductive layer for lightning or electromagnetic interference shielding; face plies on opposite sides of the conductive layer, each face ply having cutout areas to accommodate mating surfaces; removable nonporous tape placed in the cutout areas adjacent the face plies; barrier tape, placed behind the conductive layer, between the conductive layer and the corresponding face ply, complimentary to the cutout areas; and, one or more reinforcing plies placed between the barrier tape and the face ply to strengthen the mating surfaces.
Claim 12
Dependent Claim
93 words
A composite EMI shield comprising: two conductive sheets placed together to form a conductive layer for lightning or electromagnetic interference shielding; face plies on opposite sides of the conductive layer, each face ply having cutout areas to accommodate mating surfaces; removable nonporous tape placed in the cutout areas adjacent the face plies; barrier tape, placed behind the conductive layer, between the conductive layer and the corresponding face ply, complimentary to the cutout areas; and, one or more reinforcing plies placed between the barrier tape and the face ply to strengthen the mating surfaces.
Claim 13
Dependent Claim
20 words
The shield of claim 10 wherein said conductive layer comprises a pair of conductive metal mesh or metal foil plies.
Claim 14
Dependent Claim
14 words
The shield of claim 10 wherein said conductive layer comprises aluminum metal mesh plies.
Claim 15
Dependent Claim
23 words
The shield of claim 10 wherein said face plies and reinforcing plies comprise fiberglass, graphite or polyaramid fiber reinforced, resin impregnated composite plies.
Claim 16
Dependent Claim
21 words
The shield of claim 10 wherein said nonporous tape comprises a copper foil with a polyester film facing and adhesive backing.
Claim 17
Dependent Claim
15 words
The shield of claim 10 wherein the barrier tape comprises a low flow film adhesive.
Claim 18
Dependent Claim
14 words
The shield of claim 10 wherein the barrier tape comprises a polyester film tape.
Claim 19
Dependent Claim
20 words
The shield of claim 1 wherein the barrier tape comprises a polyester film tape with an adhesive peel ply backing.
Claim 20
Dependent Claim
20 words
The shield of claim 10 wherein the barrier tape comprises a polyester film tape with an adhesive peel ply backing.
References Cited (Backward Citations)
US3247574A
Cited
US3350497A
Cited
US3755713A
Cited
US4649461A
Cited
US4608453A
Cited
US4746389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |