US4960633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave-absorptive composite
Assignee: Yokohama Rubber Co Ltd
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Filing: 1987-04-20
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Granted: 1990-10-02
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Expires: 2007-04-20
Abstract
Abstract A microwave absorptive composite suitable for use in ships, aircrafts and the like comprises an outermost layer of a thermosetting resin-impregnated, fibrous sheet; an intermediate layer of a normally liquid, carbonblack-containing silicone rubber sheet; and an innermost layer of a reinforced thermosetting resin sheet, the three layers being integrally laminated in that order. The silicone rubber is curable at room temperature or with heat.
Inventors
- 👤 Misao Hiza
- 👤 Hajime Yamazaki
- 👤 Kazuhiro Sugihara
- 👤 Tetsu So
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:27
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/005; B; B32; B32B; B32B25/00; B32B25/10; B32B25/20; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31678; Y10T428/31681; Y10T428/31721; Y10T428/31786; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/109; Y10T442/116; Y10T442/30; Y10T442/3382; Y10T442/3415; Y10T442/3455; Y10T442/3472; Y10T442/3504
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A microwave absorptive composite comprising: an outermost layer including a fibrous sheet impregnated with a thermosetting resin; an intermediate layer including a resinous sheet of a normally liquid silicone rubber admixed with carbon black; and an innermost layer including a thermosetting resin sheet reinforced with at least one of a carbon fiber, metal fiber or wire mesh, a sheet of metal, a sheet of resin containing a particulate metal, and a resinous sheet surface-welded with a metal, said intermediate layer being interposed between said outermost and innermost layers and said layers being laminated together into an integral sheet structure.
Claim 2
Dependent Claim
99 words
A microwave absorptive composite comprising: an outermost layer including a fibrous sheet impregnated with a thermosetting resin; an intermediate layer including a resinous sheet of a normally liquid silicone rubber admixed with carbon black; and an innermost layer including a thermosetting resin sheet reinforced with at least one of a carbon fiber, metal fiber or wire mesh, a sheet of metal, a sheet of resin containing a particulate metal, and a resinous sheet surface-welded with a metal, said intermediate layer being interposed between said outermost and innermost layers and said layers being laminated together into an integral sheet structure.
Claim 3
Dependent Claim
33 words
A microwave absorptive composite according to claim 1 wherein said carbon black is present in an amount of less than 50 parts by weight per 100 parts by weight of said silicone rubber.
Claim 4
Dependent Claim
28 words
A microwave absorptive composite according to claim 1 wherein said fibrous sheet of said outermost layer includes at least one of polyester, polyamide, acryl and polyvinyl alcohol fibers.
Claim 5
Dependent Claim
29 words
A microwave absorptive composite according to claim 1 wherein said fibrous sheet of said outermost layer comprises at least one of silica, silicon carbide, alumina and boron nitride fibers.
Claim 6
Dependent Claim
31 words
A microwave absorptive composite according to claim 1 wherein said thermosetting resins of said outermost and innermost layers include at least one of epoxy, unsaturated polyester, novolak, polyimide and phenol resins.
Claim 7
Dependent Claim
21 words
A microwave absorptive composite according to claim 1 wherein said outermost layer has a thickness within the range of 2.0-6.4 mm.
Claim 8
Dependent Claim
21 words
A microwave absorptive composite according to claim 1 wherein said silicone rubber is of a one-pack type curable at room temperature.
Claim 9
Dependent Claim
21 words
A microwave absorptive composite according to claim 1 wherein said intermediate layer has a thickness within the range of 0.25-4 mm.
Claim 10
Dependent Claim
26 words
A microwave absorptive composite according to claim 1 wherein said wire mesh in said innermost layer includes at least one of aluminum, iron, copper and brass.
Claim 11
Dependent Claim
25 words
A microwave absorptive composite according to claim 1 wherein said fibrous sheet of said outermost layer includes at least one of organic and inorganic fibers.
Claim 12
Dependent Claim
25 words
A microwave absorptive composite according to claim 1 wherein said carbon black is present in an amount of 20-40% by weight of said intermediate layer.
Claim 13
Dependent Claim
28 words
A microwave absorptive composite according to claim 1 wherein said carbon black is present in an amount not in excess of 50% by weight of said intermediate layer.
Claim 14
Dependent Claim
23 words
A microwave absorptive composite according to claim 1 wherein said silicone rubber is of a two-pack type catalytically curable at about 50°-200° C.
Claim 15
Dependent Claim
21 words
A microwave absorptive composite according to claim 1 wherein said intermediate layer has a thickness within the range of 0.8-2.0 mm.
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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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |