US5545474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic-attenuating coating materials
Assignee: Lockheed Martin Corp
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Filing: 1994-03-01
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Granted: 1996-08-13
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Expires: 2014-03-01
Abstract
Abstract An electromagnetic-attenuating coating having fibers uniformly dispersed in a lightly loaded dielectric matrix material. The fibers are metal-coated dielectric or semi-conductive fibers such as graphite fibers and the fibers are provided in an amount of less than 1 weight % of the coating. The dielectric matrix material is a resin material such as silicone. The fiber lengths and diameters, the material of the fibers and metal coating, the thickness and tolerance range of the metal coating and the loading of the metal coated fibers in the matrix material can be adjusted depending on the frequency range to be attenuated.
Inventors
- 👤 Stanley Podlaseck
- 👤 Gene P. Shumaker
- 👤 Paul D. Rimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:15
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; B; B29; B29C; B29C70/00; B29C70/88; B29C70/882; B29C70/885; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/931; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249948; Y10T428/25; Y10T428/252; Y10T428/259; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2944; Y10T428/2956; Y10T428/2962
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
50 words
An electromagnetic-attenuating coating on a substrate, the coating comprising fibers uniformly dispersed in a dielectric thermosetting polymer matrix material, the fibers being present in an amount of less than 0.2 wt % of the coating and being effective to provide electromagnetic attenuation, said fibers comprising metal-coated dielectric or semiconductive fibers.
Claim 2
Dependent Claim
50 words
An electromagnetic-attenuating coating on a substrate, the coating comprising fibers uniformly dispersed in a dielectric thermosetting polymer matrix material, the fibers being present in an amount of less than 0.2 wt % of the coating and being effective to provide electromagnetic attenuation, said fibers comprising metal-coated dielectric or semiconductive fibers.
Claim 3
Dependent Claim
23 words
The coating of claim 1, wherein the fibers are selected from the group consisting of glass, fused silica, silicon carbide and graphite fibers.
Claim 4
Dependent Claim
12 words
The coating of claim 1, wherein the fibers have a uniform diameter.
Claim 5
Dependent Claim
13 words
The coating of claim 1, wherein the fibers have a circular cross section.
Claim 6
Dependent Claim
12 words
The coating of claim 1, wherein the fibers are rectilinear in shape.
Claim 7
Dependent Claim
18 words
The coating of claim 1, wherein the metal coating on each of the fibers has a uniform thickness.
Claim 8
Dependent Claim
12 words
The coating of claim 1, wherein the fibers are rectilinear graphite fibers.
Claim 9
Dependent Claim
16 words
The coating of claim 1, wherein the fibers have a diameter of 4 to 20 μm.
Claim 10
Dependent Claim
13 words
The coating of claim 1, wherein the fibers are nickel coated graphite fibers.
Claim 11
Dependent Claim
13 words
The coating of claim 1, wherein the thermosetting polymer is a silicone resin.
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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) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |